The National Watermelon Promotion BoardWatermelon LemonadeYou might never go back to traditional lemonade after tasting this delicious drink! Print Recipe Pin Recipe Ingredients MethodIngredients 1/2 cup lemon juice2 1/2 cups water2/3 cups agave syrup2 cups watermelon chunksMethod Place all the ingredients in a blender and blend until smooth.Serve over ice.