BLUEBERRY AND RED RASPBERRY JAM
4 cups (2 lbs.) prepared fruit
7 cups (3 lbs.) sugar
½ bottle Certo
To prepare fruit, crush or grind about 1 quart each fully ripe blueberries and raspberries. Combine fruits. Measure sugar and prepared fruit into large kettle, filling up last cup with water if necessary. Mix well and bring to a full rolling boil over hottest fire. Stir constantly before and while boiling. Boil hard 1 minute. Remove from fire and stir in Certo. Then stir and skim by turns for just 5 minutes. Pour quickly. Paraffin at once. Makes about 10 glasses (6 fluid ounces each).