To create salted glasses for these watermelon margaritas, place 1 tablespoon fresh lime juice on a small plate, and 1/2 cup coarse salt on another. Dip rims of four glasses in lime juice, then in the salt to coat.
This grown-up fruit dessert borrows flavors from margaritas. Tequila and Triple Sec infuse the watermelon slices, which also get a spray of lime juice and a sprinkling of coarse salt. The longer the watermelon soaks, the more flavorful it becomes -- one more reason to save any leftover slices.
After processing the watermelon, strawberries, lime juice, and ice, taste before adding sugar; you may not need any. For the star garnish, an adult can press a cookie cutter through the rind with the back of a wooden spoon.