Bartender James Wampler tried making this drink with many types of gin. "The one that tasted right was Martin Miller's," he says. It's a London dry gin beloved by bartenders for its exceptional silkiness.
In a cocktail shaker, muddle 1 of the cucumber slices with the mint leaf. Add the gin, lime juice and Simple Syrup and shake without ice. Fine strain into a chilled crushed-ice-filled rocks glass and garnish with the remaining cucumber slice.