My mother-in-law and I dreamed up this jam after we'd been picking blueberries one day. She wondered if blueberries, raspberries and strawberries would taste good together. So she made a test batch—and we quickly learned that they definitely did! Then I came up with my own version of the jam. I preserve everything from our garden! —Karen Maerkle, Baltic, Connecticut
2 packages (1-3/4 ounces each) powdered fruit pectin
11 cups sugar
Combine the berries and lemon juice in a stockpot; crush fruit slightly. Stir in pectin. Bring to a full rolling boil over high heat, stirring constantly. Stir in sugar; return to a full rolling boil. Boil 1 minute, stirring constantly.
Remove from the heat; skim off any foam. Carefully ladle hot mixture into hot pint jars, leaving 1/4-in. headspace. Remove air bubbles; wipe rims and adjust lids. Process for 10 minutes in a boiling-water canner.
Canning Altitude Jam-Jelly
The processing time listed is for altitudes of 1,000 feet or less. Add 1 minute to the processing time for each 1,000 feet of additional altitude.