Recipes Watermelon Lemonade By Editor - May 13, 2016 0 482 FacebookTwitterPinterestWhatsApp (Family Features) Ingredients 1/2 cup lemon juice 2 1/2 cups water 2/3 cup agave syrup 2 cups watermelon chunks Preparation Place all ingredients in blender and blend until smooth. Serve over ice. Serves 5 cups SOURCE: National Watermelon Promotion Board Ingredients