London dry gin and Pimm's No. 1 (a gin-based English aperitif) provide the foundation for this cocktail. The guava and other juices give it a tiki-esque feel, says Angus Winchester. More Gin Cocktails
Fill a cocktail shaker with ice. Add all of the remaining ingredients except the mint sprig and guava slices and shake well. Strain the drink into an ice-filled collins or highball glass and garnish with the mint sprig and guava slices.