8 basil leaves, torn, plus more for garnish
1 teaspoon sugar
1 tablespoon fresh lime juice
1 ounce vodka
3 ounces seltzer
Cut the watermelon into one-inch cubes and freeze them in a single layer for at least one hour. Muddle eight basil leaves with a teaspoon of sugar in the bottom of a glass. Stir in a tablespoon of fresh lime juice and an ounce of vodka. Add the watermelon cubes. Add three ounces of seltzer. Garnish with basil.