Ingredients

7 1/2 pounds seedless watermelon, rind removed, fruit cut into 1-inch cubes 

4 teaspoons superfine sugar 

6 ounces (3/4 cup) silver tequila 

24 basil leaves, plus sprigs for garnish 

3 ounces (1/4 cup plus 2 tablespoons) triple sec 

6 cups small ice cubes 

Preparation

Place 24 watermelon cubes on a baking sheet lined with parchment. Cover, and freeze at least 1 hour (up to 2 days).

Puree remaining watermelon and the sugar in a blender until smooth. Pass through a sieve lined with cheesecloth into a bowl. (You should have 3 cups.)

Place tequila and basil in a glass pitcher, and crush with a wooden spoon. Stir in watermelon juice and triple sec.

Place watermelon cubes in glasses. Using a cocktail shaker, mix 3/4 cup margarita with 1 cup ice. Strain into a glass. Repeat. Serve garnished with basil.