Une Vie Saine: Strawberry Champagne Slushies. Watermelonade Recipe at Epicurious.com. Photo by Roland Bello yield Makes 1 gallon (serves 16) active time 30 min total time 30 min You would be hard-pressed to find something more refreshing than watermelon. This cooler is easy to make, beautiful to behold, and not too sweet. You'll want a pitcher of it in the refrigerator all summer. Garnish: lemon slices; mint sprigs Preparation Cut watermelon flesh into 2-inch chunks and discard rind. Cooks' note: Watermelonade can be made 1 day ahead and chilled, covered.