Fresh Peach Plum Jam

Peel, pit and coarsely grind fruit separately in the blender; measures 4 cups. In an 8 to 10 quart kettle combine ground fruit, pectin and lemon juice. Bring to a full rolling boil, stirring constantly. Stir in sugar. Return to a full rolling boil. Boil hard, uncovered for 1 minute, stir constantly. Remove from heat, quickly skim off foam with a metal spoon. Ladle jam at once into hot, clean half pint jars, leaving ¼ inch. Wipe jar rims, adjust lids. Turn jars upside down for 5 minutes. Turn right side up and cool. Check when cool, check the seal by feeling for an indentation in the center of the lid. Makes 6 half pints.