Agua Fresca de Sandia (Fresh Watermelon Drink — Mexico) 8 cups loosely packed seeded  watermelon chunks 1/4 cup packed fresh mint leaves 12 ounces sparkling water Granulated sugar Ice cubes Mint sprigs, for garnish In a blender, purée the watermelon in batches, adding the mint leaves to one of the batches. Pour the watermelon juice into a large pitcher. Stir in the sparkling water and taste. Add 1 tablespoon or more of sugar if needed. Chill for at least 1 hour. Pour over ice in tall glasses and garnish each glass with a mint sprig, if desired. Variation Substitute mangoes or blood oranges for the watermelon.