* 5 cups cubed seeded watermelon
* 1 cup sparkling water, chilled
* 3/4 cup white rum
* 1/4 cup chopped fresh mint
* 1 (6-ounce) can frozen limeade concentrate, undiluted
* Mint sprigs (optional)
* Lime slices (optional)
Arrange watermelon in a single layer on a baking sheet; freeze 2 hours or until completely frozen.
Combine frozen watermelon, sparkling water, rum, mint, and limeade in a blender; process until smooth. Garnish with mint sprigs and lime slices, if desired. Serve immediately.