Make Ahead

Grandma's Best Raspberry Jam

August 25, 2018
Photo by Julia Gartland
Author Notes

This freezer jam is like a baby step version of canning. Because you never bring the jam to a boil and store in below zero temperatures, you lessen the chances of accidental contamination or heat-related mishaps. Rather than sweat over a stove, my grandma uses this method to make jam for friends and family.

One note: Freezer jams always run a little thinner than heat-processed preserves. Give them time to set to a nice, spreadable consistency. —Katie Macdonald

  • Prep time 3 hours
  • Cook time 45 minutes
  • Makes 30 pints
Ingredients
  • 14 pounds raspberries
  • 8 boxes of pectin (Grandma uses SureJell)
  • 2 cups lemon juice
  • 32 ounces corn syrup
  • 24 cups sugar
In This Recipe
Directions
  1. Crush or puree raspberries.
  2. Heat the fruit in a large pot over medium heat until baby-milk warm (Grandma's words). You never bring it to a full boil.
  3. Add the pectin one box at a time, stirring slowly. This should take about 1/2 hour.
  4. Next add the sugar, corn syrup, and lemon juice. Stir well.
  5. Prepare your jars. The jars don't need to be hot but it helps that the lids are hot when you screw on rings.
  6. After jam thickens, let stand for 3 hours at room temperature. Then store in freezer.

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