2 ounces gin
3/4 ounce fresh lime juice
3/4 ounce simple syrup
Cucumber wheel or lime wedge, for garnish
Fill a cocktail shaker with ice and pour in the gin, lime juice and simple syrup. Stir vigorously with a long cocktail spoon until very cold.
Strain into a chilled coupe or martini glass, or strain over a rocks glass filled with ice, depending on preference. Garnish with the cucumber wheel and serve immediately.