Ingredients for 4 glasses:
3 pound wedge of seedless watermelon
4 scoops (1 cup) lemon gelato or ice cream
2-3 tablespoons Grenadine syrup
Club soda (optional)
Cut the watermelon into 1" chunks, removing any seeds you may find. Combine the melon pieces with the ice cream and Grenadine syrup in the work bowl of a blender or food processor. Pulse for 10 seconds then run continuously for another 15 seconds until the puree is smooth.
Serve with a splash of club soda if desired.