3 cups apple juice
3 cups blackberry juice
3 -5 tablespoons lemon juice
7 cups sugar
Blend 3 cups of apple juice and 3 cups of blackberry juice together in a deep saucepan.
Cook for 5 minutes.
Add the sugar and 3 to 5 tbsp of lemon juice if the fruit juice is not tart enough.
Let the mixture boil for 1 full minute, then remove from heat.
Skim off foam and pour juice into hot, sterile jelly glasses.
Process 5 minutes in a hot water bath.