Watermelon Lemonade Jam Posted in Watermelon Recipes Print Recipe Watermelon Lemonade Jam Perfect mix of sweet and sour. Enjoy the jam with soft cheese and crackers – we loved it with butter and warm biscuits. Either way, we’re sure you’ll love it! Servings: 3 8 ounce servings Author: The National Watermelon Promotion Board Ingredients3 cups watermelon puree juice and flesh1/4 cup Apple Cider Vinegar1/2 lemon juice from lemon1 cup sugar3 tablespoons low sugar pectin3 jelly jars with lids 8oz InstructionsRemove rinds and puree all watermelon flesh and juice in blender with all wet ingredients, until fruit is smooth (consistent in texture). Add the pectin and blend quickly to evenly incorporate. In a large pan simmer mixture for 5 min on medium-low. Increase temperature to medium-high heat till reaches a full boil (that can’t be stopped when stirring) and hold for a minute. Slowly incorporate sugar. Return to a full boiling and hold at hard boil (that can’t be stopped when stirring) for one minute. Makes about three 8 ounce jars. Pour into small glass jars and lid. Be careful – the jam will be very hot! Allow to cool to room temp and keep in refrigerator for up to two weeks.