Step 1

Place the watermelon cubes in a blender container and blend on high speed until puréed. I like to strain mine through a fine-mesh sieve to remove the pulp, but that is optional. Chill the watermelon juice until ready to use.

Step 2

Salt the rim of 4 glasses by running a lime wedge around the rim and dipping it in coarse salt. Fill with ice.

Step 3

For each cocktail, combine 3 ounces of watermelon juice, 1½ ounces of tequila, 1-ounce of lime juice, and 1 ounce of triple sec in a cocktail shaker. Fill with ice.

Step 4

Shake until the outside is frosty, about 15 seconds. Pour into the cocktail glasses. Garnish with a lime wedge and serve immediately.