- Yellow or pink cocktail sugar or sanding sugar (sold at specialty stores), optional
- 1 cup cubed seedless watermelon
- Ice cubes
- 3 1/2 ounces limoncello
- 1/2 ounce lemon-flavored or light rum
- Splash club soda
- Lemon wedge
Rim a rocks glass with the sugar, if desired, and put in the freezer. Puree the watermelon cubes in a blender until juicy.