Email to Aunt Saunny Easy Watermelon Jelly Source of Recipe Aunt Saunny 5 cups watermelon juice 5 cups sugar 1/4 cup lemon juice Bring the juice to a boil; add sugar, a little at a time. Add all the lemon juice. Cook until jelly will sheet off a spoon. Pour into hot, sterilized jars and seal. Yields: 8 half-pints