Modified from Taste of Home
4 cups fresh blueberries (I used frozen mixed fruit)
3 cups fresh strawberries
2 cups fresh raspberries
1/4 cup bottled lemon juice
2 packages (1-3/4 ounces each) powdered fruit pectin
7 cups sugar
In a large saucepan, combine berries and lemon juice; crush 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 and stir 1 minute.
Remove from the heat; skim off foam. Ladle hot mixture into jars. Wipe rims and add lids.
Process for 10 minutes in a water bath canner.
Makes 10 pints.