Summer

Roasted Tomato Jam

June  6, 2021
5
9 Ratings
Photo by James Ransom
  • Prep time 20 minutes
  • Cook time 2 hours
  • Makes about 3 cups
Author Notes

This recipe was inspired by the following conversation on Hotline about whether or not you can make jam by roasting it in the oven: http://food52.com/hotline... No stirring? No mess on your stove? No worrying about burning the preserves if you walk away from the stove for a few minutes? I had to try it!

Roasting jam delivered on its promises -- I layered sliced tomatoes with sugar and spices in a round braising pan, and let the oven do the rest of the work. I checked on the jam a few times but with the even heat of the oven, there was never any worry that the jam would stick to the pan base. And the edges of the tomatoes on top caramelized a bit. What more could I ask for? Next up: peaches! —Amanda Hesser

What You'll Need
Ingredients
  • 2 cups sugar
  • 3 pounds ripe beefsteak tomatoes, cored and thinly sliced (1/4 inch)
  • Large pinch salt
  • Grated zest of 1 lemon
  • Juice of 1 lemon
  • 1 cinnamon stick
  • 1/2 teaspoon fennel seeds, lightly crushed
  • 2 dried red chiles
Directions
  1. Pour 1/3 of the sugar over the base of a 12-inch braising pan or other baking dish. Layer half the tomatoes, overlapping the slices, in the pan. Sprinkle with the salt, 1/3 cup sugar, and top with the lemon zest, lemon juice, cinnamon stick, fennel seeds, and chiles. Top with the remaining tomatoes, followed by the rest of the sugar. Let sit for 30 minutes. Heat the oven to 400 degrees F.
  2. Place the pan, uncovered in the oven and let cook for 1 hour. The tomato juices should simmer actively. Check every 20 minutes, spooning the juices over the top tomatoes, and removing the chiles if they char.
  3. Continue roasting and checking every 20 minutes -- the tomato juices should begin to gel at 2 hours, but it could happen a little sooner or later. Test the juices by spooning a little onto a plate, letting it cool, and running your finger though it. If it holds the line, the jam is ready. Remove the jam from the oven and let cool. I eat this jam fresh so I put it into jars and keep it in the fridge.

See what other Food52ers are saying.

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Amanda Hesser

Recipe by: Amanda Hesser

Before starting Food52 with Merrill, I was a food writer and editor at the New York Times. I've written several books, including "Cooking for Mr. Latte" and "The Essential New York Times Cookbook." I played myself in "Julie & Julia" -- hope you didn't blink, or you may have missed the scene! I live in Brooklyn with my husband, Tad, and twins, Walker and Addison.

121 Reviews

MzMoonpie August 17, 2023
Holy cow. That’s scrumptious. I can only make so many batches of spaghetti sauce and salsa with all these garden tomatoes. This is an excellent new use for our glut from the garden. F I don’t tell my kids it’s tomatoes, they’ll very likely gobble it up.
 
MzMoonpie August 17, 2023
Also, I used dried guajillo chiles
 
Kaite September 10, 2020
Amazing! I wanted to keep the flavor fairly neutral, so I opted to not put in the cinnamon or fennel. I could see though how you could play around with different spices and may experiment more. This was a breeze to make although next time I will skin the tomatoes as my husband commented on how tough the skins were to eat. I went through and picked out as many as I could. This jam has a faint taste of tomatoes, but really reminds me a lot of strawberry jam. I slathered it on a piece of buttered toast and fell in love with it.
 
Happy B. August 1, 2020
This recipe is a gem! I make this jam every summer when the tomatoes are ripe. Thank you!
 
Amanda H. August 1, 2020
Ahh -- love hearing this! Thanks for sharing!
 
Kevin F. June 1, 2020
Just made this today, but 3x the batch (yes, 9lbs of tomatoes)! Followed the ingredients to the letter, except for subbing red pepper flakes for the dried chilis as I didn't have any. Obviously the cook time was much longer, but this came out perfectly. I am debating leaving tomatoes in strips or doing a quick pulse in the food processor to chop these up for easier spreading. Debating...
 
Amanda H. June 7, 2020
Thanks for reporting back on your experience! 9 pounds! Hope you're enjoying the batch.
 
Amy June 27, 2020
Curious if you put these in the processor and what the result was. I have a batch in the oven now and am wondering about the skins.
 
Mariam September 21, 2019
Seems creative, but I wonder if I can use honey or maple syrup or molasses instead of sugar and what can I use instead of fennel seeds if I don't have them?
Thanks in advance
 
Amanda H. September 28, 2019
Hi Mariam, I think honey, maple syrup, or molasses might be too strong in flavor. You might want to try agave. Not sure how this will affect the texture, but it's worth trying. Instead of fennel seeds, you could use aniseed. Or just leave it out. Hope this is helpful!
 
Mariam September 28, 2019
Thanks a million. I'll give it a try.
 
Bret R. September 20, 2018
You never say when to add the salt.
 
Amanda H. September 20, 2018
Thanks for the catch -- added it to step 1!
 
mallory December 4, 2017
Is this possible to make in the winter? Id love to jar it and give it as a holiday gift along with artisanal cheese and crackers?
 
Amanda H. December 4, 2017
Hi Mallory, if you can get good tomatoes, absolutely.
 
Kate's K. August 14, 2017
I wanted to like this so much however it was just too sweet for me.
 
Scott B. August 6, 2017
If you store it in the fridge, can you tell me the expected shelf life? I'm guessing you could freeze some covered with EVOO...
 
Amanda H. August 7, 2017
In the fridge, I'd say 10-14 days. I haven't frozen it but I don't see why not.
 
Tracy July 14, 2017
Could cherry tomatoes be used for this? I believe I may have a plethora soon. Planning on cutting way down on the sugar, too.
 
Amanda H. July 14, 2017
It'll have a higher ratio of skin to pulp but I think it should work. Let me know how it goes.
 
Molli B. March 5, 2017
SPRING IS ALMOST HERE AND PLANNING OUR GARDEN AT THE RANCH---TYPICALLY WE PLANT ABOUT 65 TOMATOE PLANTS. OBVIOUSLY WE "LOVE" ANYTHING TOMATOE---HOW WOULD I "CAN" THIS RECIPE FOR LONG TERM STORAGE AND GIFTING?
 
Amanda H. March 12, 2017
Hi Molli, I wish I had an answer for you -- I'm not sure this recipe is safe for canning so I don't want to recommend that you do so. If anyone on this thread is an expert at preserving, please weigh in!
 
Patty H. August 12, 2017
I think this recipe is fine for waterbath canning because the sugar two tomato ratio is so high.
 
Maria P. September 13, 2016
This recipe is the bomb! I used lime juice instead of lemon because it was what I had. Also, I added a star anise pod with the half cinnamon stick I had. The two dried chillis were one of those on the top 10 hottest chillis in the world charts. The spread wasn't crazy hot. It was perfect. And it is not going to last long. Maybe I should've made less gazpacho, and more of this deliciousness!
 
bmgid August 23, 2016
How long would this stay in a fridge? Can you freeze it? Looking at a lot of Jersey fresh August tomatoes in my garden and something other then gazpacho or sauce to keep a while for the deep dark days of winter….
 
EL August 23, 2016
Hi bmgid: When I do this, I don't include sugar (it doesn't really seem to need it in my mind) and I add dried boletes (porcini mushrooms) to mine.. It easily lasted in my fridge (which is cooler than many) for at least a week (it got eaten fast). I also put some in freezer bags and froze as is and it still tasted great. I haven't tried the ones that I canned so I don't know how that affects the taste.
 
EL January 7, 2016
I make an incredible savory tomato spread this way, inspired by "The quarter acre farm". It's great with goats cheese or cream cheese. Just throw toms, onion, garlic and some porcini in a Dutch oven along with oregano and some Italian spice mix and roast at about 400. Stir once every half hour. When it starts to get thick, turn the oven off and walk away. Who says jam has to be sweet? I mostly do this because it tastes heavenly, but also because I tend to have tomatoes like other people have zucchini. Trade anyone?
 
Kelsey S. October 13, 2015
Brilliant. Just brilliant.
 
Amanda H. October 14, 2015
Thanks, Kelsey!
 
beejay45 October 29, 2014
After seeing this recipe and reading these comments, I'm going to try making my prune and chili chutney this way. Do you think it would work for an onion and garlic jam, a la Stonewall Kitchen? I love that stuff and buy it by the case, but I'm almost out, and it would be great if it were this easy to make. ;)
Thanks, Amanda!
 
Amanda H. October 30, 2014
By "prune" do you mean a prune plum or the dried fruit? If it's the former, yes, I think it would work well. If it's the latter, I'd be concerned about having enough moisture when cooking it. You could add water, certainly (I might add some wine or brandy :) ). Definitely worth a try.
 
beejay45 October 30, 2014
Having grown up in prune country, I'm used to calling them prunes even when they're still on the tree. So, yes, the prune plum. I have an ancient tree (roughly 100 years old) that's gnarly and almost lying on the ground, but every year it produces the most wonderful prunes. I've been making things like prune and chili chutney with them but doing it on the stove, and me being easily distracted, I've ruined more batches than I care to admit. So, thank you Amanda, I will give this a try, but next year -- mine are already all gone this year.
 
Amanda H. October 30, 2014
If you try it next year, please let me know how it goes -- I'm curious!
 
beejay45 September 13, 2016
Sad, sad tale...I'm out in the country, and there has never been a fence between my and my neighbor's places. Their place was sold last year, and the new owner "miscaculated" the property lines and had that "ugly old tree" bulldozed! No more plums. He also had the fieldstone BBQ my grandfather built about 80 years ago bull dozed. First he said the guy doing the work must not have see it. How do you miss something seven feet tall, 5 feet wide and six feet deep made out of fieldstone and concrete? It must have taken more than one run to knock that down. Sigh. He's a lovely person, but he really should not be allowed to employ men with earth moving equipment. Sorry for the rant.
 
Amanda H. September 14, 2016
Truly sad -- so sorry to hear this.
 
Shelby October 15, 2014
What a beautiful recipe this turned out to be! I made this for a family camping trip and served it with goat cheese and crusty bread--it was completely devoured! This one is a keeper! Thank you :)
Shelby from Florida
 
Diane September 26, 2014
I agree with Amanda. I made another batch of this yesterday and it turned out great. I used 1 tablespoon of dried chili flakes and liked the heat of the jam. I used 1 pound of roma/plum tomatoes and 2 pounds of beefsteak tomatoes. I cooked it for about 2 hours. Timing was just right. Last time I think I cooked it for almost 3 hours, which was too long. I miss read the recipe thinking it needed to cook for 3 hours. Thanks again Amanda, nice recipe.
 
Amanda H. September 26, 2014
Thanks and so glad it turned out this time!
 
pamelarupright September 25, 2014
Any thoughts about whether I could use lighter-colored heirloom tomatoes (yellow-reddish) for this?
 
Amanda H. September 25, 2014
Sure -- why not!
 
Tonya September 1, 2015
I used yellow boys and it's a really beautiful amber color and delicious!
 
Diane September 14, 2014
I made this for the first time today. Wow I really like it! Used a mix of roman and beefsteak tomatoes and 2 teaspoons of dried chilies flakes. The colour and taste turned out fabulous. Mine turned out very thick once it cooled. Next time I will cook it a little less (less then 2 hours). Loved that it was so easy. Served it on top toasted baguette slices with Brie and briefly warm in the oven. I am going to get some more tomatoes and make again today. This time it will add more chiles because I like the extra heat. Thanks for a great recipe!
 
Donna P. June 27, 2014
And poof! It thickened and it is beautiful! I used the chili flakes (1 tsp), the taste and color is amazing!
 
Amanda H. June 29, 2014
So glad it worked out!
 
Donna P. June 27, 2014
I'm on the third hour and still no gel...were my tomatoes too juicy? It tastes awesome, but it's very runny...
 
Joseph F. June 8, 2014
I'm confused, he recipe says to cook for 1 hour then says it should jell around two hours and then remove from oven. Am I supposed to continue baking until jelled or turn off oven after an hour and let sit in the oven until it jells?
 
Amanda H. June 8, 2014
Joseph, thanks so much for pointing this out -- yes, you do want to keep roasting it for another hour (though it could gel sooner). I've just adjusted the recipe -- see step 3. Thanks again!
 
David Y. June 7, 2014
these sound amazing! I have ben experimenting with lots of different veggies for healthy snack ideas and love tomatoes in the dehydrator( try taco seasoning or basil) anyways... has anybody tried canning this recipe? please let me know as I am always coming across bargain tomatoes.
 
em-i-lis November 10, 2013
I am obsessed with this too! It is SO, SO good. Just made another batch!
 
piccantedolce October 24, 2013
So, I'm obsessed with this jam from the ease in making it to how delicious it is. I was wondering if anyone has tried it with green tomatoes? I've got 7lbs from my garden that I need to process and I'm wondering if it will work. Any thoughts?
 
EmilyC October 10, 2013
I made this and shared a small jar with my neighbors. A thin layer of this on good bread makes for a killer grilled cheese sandwich with aged cheddar and a little baby arugula or spinach. Love the fennel and chile in it.
 
sexyLAMBCHOPx September 30, 2013
Any chance of a sugar substitute for a diabetic?
 
Amanda H. September 30, 2013
I don't know the answer but hopefully someone will weigh in!
 
Jo S. May 5, 2014
Why don't opt for Stevia? Look here: http://en.wikipedia.org/wiki/Stevia
 
Violeta September 30, 2013
I've just made it. Brilliant taste! I used crushed dried chilli, about a teaspoon. Thank you so much Amanda for sharing this recipe with us.
 
Amanda H. September 30, 2013
Thank you!
 
jeff September 29, 2013
I have made this twice and in process of the third time with all sorts of tomatoes from the garden.....plus alot more chilli as well as once 3 cloves of very thinly sliced garlic.....anyway you make it..ITS AMAZING!!! THANK YOU!! Huge fan of this site for years and just now joined so i could comment about this recipe....although ive made tons of others from here. THANKS AGAIN:::ITS BRILLIANT!!!
JR
 
Amanda H. September 29, 2013
Jeff, thanks so much for your thoughts -- I love hearing about improvements and variations on recipes. And thanks for making your first comment!
 
Violeta September 26, 2013
This sounds sooo good. I'll definitely give it a go! I make plum jam in oven and it always works. :)
 
QueenSashy September 18, 2013
I finally got to making this jam! I served it for dinner with grilled pork chops, everyone was in heaven. I also filled small cute jars for the friends to take home.
 
Amanda H. September 18, 2013
Two for one! :)
 
Antonia A. September 17, 2013
I substituted 2 Tb + 1 tsp Aleppo pepper as I had no chiles on hand and no inclination to shop again. Delish!
 
Leo S. September 13, 2013
This looks amazing, I'll have to go to the grocery store tomorrow and buy the ingredients.
 
Terry T. September 12, 2013
Is there a way to preserve this recipe for later gift giving ? If I make the jam this weekend. Can I give them as gifts in December ?
 
Amanda H. September 13, 2013
Hi Terry, if you scroll down to the very end of the comments, there's a good discussion about this -- and how to do it properly so it will keep for gift giving.
 
Sarah F. September 11, 2013
I used this method to make a roasted Italian plum jam to serve with Dijon-rubbed pork tenderloin. It was delicious and the leftover plum jam was perfect with a cheese plate the next night! http://www.strawberryplum.com/pork-tenderloin-with-roasted-italian-plum-jam/
 
Cydney P. September 8, 2013
I am making this but subbing basil for the fennel seeds, cinnamon and chilis because this time of year I have a lot of fresh basil on hand from my garden. I also have a lot of tomatoes, so I used about 4.5 lbs, increasing the recipe accordingly. It is taking a little longer, but smells wonderful! I love this technique as I am tired of having to blanche and peel tomatoes at this point, so I appreciate the "rustic" approach.
 
Zoom September 7, 2013
I halved the recipe because I didn't know if I'd use it all. I think I overcooked it a little. I definitely needed to cut back on the cooking time. The taste is great, but mine is almost like tomato caramel at this point.
 
Bevi September 5, 2013
I made this today and it tasted very good. The tomato skins developed a candied texture that I think actually adds texture to the finished jam. Processed in 1/4 pint jars, it makes a great neighborly present, as my neighbor is about to find out!
 
Amanda H. September 6, 2013
What a nice neighbor you are!
 
student E. September 5, 2013
wow, just made this -- unbelievably delicious! really, one of the best things i've made off of food52 this summer.
 
Amanda H. September 5, 2013
Thanks for making my day!
 
Margit V. September 4, 2013
I'd probably freeze whatever I would't use up from the fridge within a couple weeks.
 
sticksnscones September 4, 2013
I loved this recipe...just delicious on a melty cheese sandwich! Mine had lots of strips of the tomato skins that didn't break down. I'm wondering if I should have peeled the tomatoes first?
 
Amanda H. September 5, 2013
The tomato slices and skins should have stayed mostly intact, so it sounds like yours turned out right. If you don't like the tomato skins, you can either peel the tomatoes before cooking or simply cut the tomatoes into chunks so the skins are minimized.
 
em-i-lis September 3, 2013
this is really, really good!
 
Amanda H. September 5, 2013
Thank you!
 
Lucy M. September 2, 2013
Think this would work with the case of late season peaches that I bought this weekend? I would leave out the chile and fennel.
 
Amanda H. September 5, 2013
Yes -- you might need to make minor timing/sugar adjustments but it should work.
 
Lucy M. September 6, 2013
Tried it with the peaches! I should have held back on the sugar a bit, and next time I'll slice the peaches very thinly, or perhaps dice them. But, still, fantastic technique! Trying the tomato version tomorrow!
 
Amanda H. September 6, 2013
Thanks for the feedback!
 
Judith O. September 2, 2013
Do you eat tomato jam just like other fruit jams? I made some with our organic tomatoes. The gel turned out good. Not sure if I like the skins, and the ceramic dish had a burnt sugar ring from the simmering. Do you line your pan with foil for easy clean-up? Any other ways to serve this jam? Thanks.
 
em-i-lis September 2, 2013
Hi! I'm going to use my batch in a more savory way than I would a traditional fruit jam: perhaps spread atop goat cheese and grilled bread, on a grilled cheese, etc...I used an enameled cast iron pan and didn't have the burned sugar problem (and it was easy to clean), so perhaps next time you could try a different pan? I'm sorry about yours! I might lessen the sugar by about 1/3 of a cup next time...
 
Judith O. September 2, 2013
I made peach chutney from 'Food in Jars' and ate with goat cheese and baguette. It is a similar sweet/savory combination. I guess I love fresh tomatoes so much that the extra sugar isn't needed. I will try less sugar next time, and probably use only the pulp. It does seem like a great way to use the garden's bounty. Thanks.
 
FoodieDawn September 3, 2013
Can't wait to try it on biscuits, maybe with a little ham or cheese, or a cheesy biscuit.
 
Amanda H. September 5, 2013
What em-i-lis and AAFoodie said!
 
TheWimpyVegetarian September 1, 2013
LOVE tomato jam. And this looks fantastic. Super cool way to make it by roasting in the oven too. Picking up tomatoes this weekend to give this a test drive. Thanks for posting this!!!
 
Amanda H. September 5, 2013
Thanks -- and hope you like it!
 
Jill E. August 30, 2013
I just finished making this, and I'm in heaven. Swapped in chili flake for the chiles, and used a variety of heirlooms: yellow, orange, green, and red. Can't wait to share a pretty photo in the AM! Thanks Amanda!
 
Amanda H. September 5, 2013
I might use chili flakes next time, as well. How much did you use?
 
Jill E. September 5, 2013
About 2 teaspoons, brought the perfect little kick of heat and warmth at the end.
 
Amanda H. September 5, 2013
Thank you!
 
EmilyC August 30, 2013
Love everything about this jam. I can't think of anything better than this for a late summer hostess gift! Can't wait to try it.
 
Amanda H. September 5, 2013
Thanks!
 
Dawn R. August 29, 2013
This feels like a lot of sugar ... is it really sweet? Do you think I could cut it back?
 
Amanda H. August 29, 2013
It's 30% less sugar than classic jam recipes, so it's not super sweet, but you can definitely try making it with less sugar.
 
susan G. August 30, 2013
I made it today with 1 1/3 c sugar, and it still set up nicely and tastes sweet to me. I wonder if it won't keep as long, though. The color is extraordinary!
 
susan G. October 28, 2014
It got lost in the fridge -- 1 year later, and the color is perfect as well as the keeping quality!
 
fernetaboutit August 29, 2013
I want to make this! It sounds delicious!! I have never made jam before, however, and I have a question about the procedure. Do you turn off the oven after the one hour cook time and let it hang out there until set? Or do you continue to cook it until it sets?
 
Amanda H. August 29, 2013
Great question -- just keep cooking it until it sets. Mine took about 2 hours but it's a good idea to check on it after an hour.
 
fernetaboutit August 30, 2013
Thank you! Trying it tomorrow.
 
Devangi R. August 29, 2013
I am in love with this jam..I think I am making a batch and store it with the help of waterbath process. I just love the idea of fennel seeds. I made one recently with strawberry and fennel seeds.
 
Amanda H. September 5, 2013
Strawberry and fennel sounds wonderful.
 
savorthis August 29, 2013
I make a more savory roasted tomato jam all the time but this sweet, tangy, spicy version sounds great and can swing both ways!
 
Amanda H. September 5, 2013
I like savory tomato jam as well -- perhaps you'll share your recipe? :)
 
Kukla August 29, 2013
How Wonderful Amanda!!! I love everything about this recipe, but most of all, its simplicity with an amazing result. Good luck and thanks for the recipe! Later in the fall I’ll use your method for cooking my favorite Plum Jam.
 
Amanda H. September 5, 2013
Thanks, Kukla!
 
drbabs August 29, 2013
wow, so creative!
 
Amanda H. September 5, 2013
Thanks drbabs!
 
em-i-lis August 29, 2013
Amanda, do you think I could, after it finishes up in the oven, spoon this into jars and waterbath process it?
 
Amanda H. August 29, 2013
Yes, I believe so because it's fully cooked.
 
Rhonda35 August 29, 2013
I don't think you even have to waterbath it. I'd can this like any other jam: clean jars filled with boiling water to keep sterile, lids kept sterile in a pan of simmering water. Make your jam, while it's still piping hot, put it in the jars one at a time - dump out the hot water, add the hot jam, wipe off the rim if necessary, using tongs place the canning lid on top, add the ring, tighten and turn the jar upside down on a kitchen towel. Fill the next jar, etc. Once all jars are fully cooled, turn them right side up and tap the lids. You will be able to tell if they are sealed by the sound. I rarely have one that doesn't seal and I have canned jam this way for over two decades. Amanda, I've made apple butter in a Dutch oven this way and LOVE the idea of roasted tomato jam.
 
capers August 29, 2013
Ohh, want the apple butter recipe...
 
SeaJambon September 4, 2013
Canning this particular recipe is kind of a tricky thing. Here's the deal -- fruit jams can be safely water bath canned because they are high acid. That's also why pickles can be water bath canned -- the item being pickled may not be high acid, but a tested recipe will have enough vinegar that you've reached/exceeded your high acid safety level of 4.6 or less (yes, less -- it is the pH scale, and higher acid has a lower number). Tomatoes are funny as historically they have been lower than 4.6, but not by much. And, the newer breeds are bred to be sweeter and less acid - great for fresh uses but a bit challenging for canning. These days, most reputable sources are recommending adding a bit of acid (like vinegar) when canning tomatoes "just in case". So, with a tomato jam like this (where there is no vinegar and you don't know the pH of your tomatoes) you may actually want to do pressure canning. Rhonda35, you may be interested to know that the "upside down sealing method" is STRONG discouraged (in my Master Food Preserver course it wasn't discouraged, it was forbidden -- as was wax tops. FWIW: I had happily and successfully used both methods for years before getting certified; now I don't).

Canning and food preservation is fun and easy, but the high acid rule is one that shouldn't be disregarded.
 
Amanda H. September 5, 2013
Thanks for this SeaJambon!
 
em-i-lis September 5, 2013
these are excellent points, seajambon. and i'm glad you bring up the wax top issue because yes, it is definitely considered unsafe these days!
i ended up coming down on the "it's safe" side re: waterbath canning amanda's jam, and here's why: eugenia bone (author of: well-preserved) adds only 6 tsp salt and 1.5 tsp fruit fresh (citric acid) to 7 pounds of tomatoes that she has you stew for 5 mins, and then waterbath process for 40.
since amanda's cooks so long, has a good amount of sugar, AND the juice of an entire lemon + the zest, i think the acid level is safe being that i believe it's comparable to bone's. i put amanda's in half-pint jars and processed for 12 minutes after removing the jam from the oven and bringing it to a boil on the stovetop.
what do you think?
 
em-i-lis September 5, 2013
oh, and bone cans her tomatoes in pint jars, somewhat hence the longer processing time. and versus her 7 pounds, Amanda uses just 3.
 
SeaJambon September 5, 2013
So funny - I was looking for vinegar for the acid and read right past the "juice of one lemon" (! don't sign me up for a proofreading job!). Emily, I agree that with that much lemon juice (basically, one T or more per lb of tomatoes) you should be safe with a standard 10 minute water bath (12 is even better!). I just found among my tested recipes (Univ of Georgia - So Easy to Preserve) one for "Spiced Tomato Jam" that has 1/4 c lemon for 3 cups (2.25 lbs) tomatoes that has 10 minutes in a water bath. Since "juice of one lemon" is usually pretty close to 1/4 c, just a touch more lemon would make the ratio the same and make me even more comfortable!
 
em-i-lis September 5, 2013
i now feel even better about the jam sitting in my pantry! thanks SJ! :)
 
Tonya August 9, 2015
Thanks for the input on canning for storage. I have a bumper crop of yellow boys this year and I think this jam fits the bill for making sure I use them.
 
em-i-lis August 29, 2013
I want to make and eat this RIGHT now!