Prevent your screen from going dark
Time 10 minutes, plus freezing time
Cut a small watermelon into small chunks (discarding the rind), and freeze them. When they’re frozen, put them in a food processor with ½ cup yogurt, 2 tablespoons sugar and a tablespoon of lemon juice. Process until just smooth, being careful not to let it become watery. Transfer to a shallow glass or ceramic dish, and freeze for at least an hour.
— Recipe from The New York Times