Bobby Flay covered a great watermelon margarita recipe on his show "Boy Meets Grill" which I have faithfully reproduced here in order to spread the news of the Mighty Bobby Flay, He Who Will Save Us All and Cure Your Ills. Yes, he's that great.
5 cups cubed watermelon, seeds removedTags:
1/2 cup simple syrup (equal amounts sugar and water, heated until sugar melts), cooled
1/2 cup fresh lime juice
2 cups silver tequila
4 ounces orange liqueur
2 ounces melon liqueur
Watermelon wedges, for garnish
Place watermelon in a food processor and process until smooth. Pour the pureed watermelon into 2 empty ice cube trays and freeze until firm, at least 4 hours. Place 8 martini glasses in the freezer to chill.
Place 2 cups of the watermelon ice cubes and the remaining ingredients in a blender and blend until smooth. Pour into 4 glasses and repeat with the remaining ingredients. Garnish each glass with a watermelon wedge.