Active time: 25 min Start to finish: 45 min

Ingredients

　　1 (4-lb) piece watermelon (preferably seedless), rind and any seeds discarded and fruit cut into 1-inch chunks

　　2 mangoes (1 3/4 lb total), peeled, pitted, and cut into 1-inch chunks

　　1 tablespoon fresh lime juice, or to taste

　　1 teaspoon finely grated fresh lime zest

　　1/2 teaspoon sugar, or to taste

　　Toss together all ingredients and chill, covered, stirring occasionally, 20 minutes.