England's Fever-Tree tonic water (available in U.S. grocery and specialty stores) has a refreshing astringency that makes it Angus Winchester's choice for this tangy, mint-infused drink. More Gin Cocktails
In a cocktail shaker, muddle the mint leaves. Add ice and the gin, lime juice and passion fruit nectar and shake well. Strain into an ice-filled rocks glass, stir in the tonic and garnish with the mint sprig.