Make Ahead

Sweet Onion and Rosemary Jam with Sage Butter Crostini

December  5, 2011
8 Ratings
  • Makes 3 cups
Author Notes

I recently tried out a super hyped-up restaurant here in Chicago, not expecting much. I was surprisingly wrong and left wondering how on earth some of the flavors came together. My number one mission when I left was to attempt to reconstruct the onion jam and sage butter we had as an appetizer. My gosh was it amazing. Here's my attempt at what I found to be a delightful start to a meal. —Brussels Sprouts for Breakfast

What You'll Need
  • For the Sweet Onion Rosemary Jam
  • 3 large red onions (sliced thinly)
  • 1/4 cup balsalmic vinegar
  • 1/4 cup red wine vinegar
  • 1/4 cup dry white wine
  • 4 cloves garlic (rough chop)
  • 1/4 cup honey
  • 3 tablespoons sugar
  • 1 bay leaf
  • 3 sticks rosemary
  • 1/2 teaspoon crushed red pepper flakes
  • 1 tablespoon whole black peppercorns
  • 1 tablespoon kosher salt
  • 2 tablespoons unsalted butter
  • 2 tablespoons olive oil
  • For the Sage Butter
  • 1 stick unsalted butter
  • 5 sage leaves (rough chop)
  • 1 teaspoon kosher salt
  • 1 loaf of bread toasted with olive oil and salt
  1. In a large, thick bottomed pot, heat the butter and oil over medium heat. Add all the onion, garlic, rosemary, bay leaf, whole peppercorns and salt. Give the pot a good stir to make sure the onion is coated in oil and butter. Cover and let simmer for 20 minutes. Lower heat to medium low if anything looks like it is sticking to the bottom of the pan and burning.
  2. Add the balsamic and red wine vinegars, white wine, honey and sugar. Add a bit more salt. Give the pot a good stir and let cook for 20 more minutes, uncovered. Stir the mixture occasionally to ensure nothing is burning. Adjust temperature as necessary.
  3. Remove the rosemary sprigs and bay leaf. Some of the rosemary leaves will have fallen off, but don't worry, leave them in. The liquid should be reducing at this point. Cook for another 20 minutes (60 minutes total). Taste to see if salt should be adjusted.
  4. Transfer the mixture to a food processor or blender and give a few quick pulses. You want to break up any rosemary leaves, and make the jam "spreadable", but not turn it into mush.
  5. While the jam cooks, prepare your sage butter. Simply heat the butter, sage and salt over low heat. Let cook together for 10 minutes. Strain through cheesecloth into a small container and cool in fridge.
  6. Serve the sage butter and onion jam together on any kind of bread you have! I used a big loaf of freshly baked, warm multi-grain bread to make the crostini.
  7. The jam can also be sealed up and sent off as a wonderful holiday gift!

See what other Food52ers are saying.

  • lorigoldsby
  • Brussels Sprouts for Breakfast
    Brussels Sprouts for Breakfast
  • Tarragon

4 Reviews

lorigoldsby December 5, 2011
Sounds good...which hyped up restaurant was it? We liked Vermillion
Brussels S. December 6, 2011
Girl and the Goat (Stephanie Izard's restaurant from Top Chef) IT was so fantastic. I've never been to Vermillion yet, I'll have to check it out!
Tarragon December 5, 2011
Awesome photo! Sounds great.
Brussels S. December 6, 2011
Thanks Tarragon!