This summery riff on a Moscow Mule adds fresh watermelon purée to the classic combination of vodka, ginger beer, and lime. Ginger beer is similar to ginger ale, but has a more pungent, crisp flavor.
Purée the watermelon in a food processor until smooth; strain. You should have 3 fl. oz (6 Tbs.) juice.
Pour the watermelon juice, vodka, and lime juice into a chilled cocktail shaker and fill with ice. Shake for about 10 seconds then pour into a Collins glass filled with ice. Top off with the ginger beer and garnish with the lime slice.
Photo: Scott Phillips