The Moscow Mule is one of the most popular cocktails in the world. Even those who typically don't order mixed drinks have likely had a Moscow Mule on occasion. The refreshing blend of vodka, ginger beer and lime served in an ice-cold copper mug is too perfect to neglect. But as with many classic cocktails, the Moscow Mule is ripe for experimentation, and over the years the original has spawned countless variations. The Gin-Gin Mule was created by Audrey Saunders at her New York bar Pegu Club, serving as a gateway gin drink for vodka lovers. The Kentucky Mule subs bourbon for vodka, appealing to fans of brown spirits. And the Mezcal Mule features—you guessed it—mezcal. Considering how easy it is to swap spirits, it's unclear when the first mezcal-based mule was served, but this Mezcal Mule was created by Jim Meehan at PDT, the famed New York bar. Like many cocktails served at PDT, the recipe includes a few flourishes that take this drink beyond a simple substitution. Vodka, ginger beer and lime lead the way, as you'd expect. From there, Meehan calls on passion fruit purée for its unique mix of tart, tropical sweetness, and muddled cucumber for a fresh, aromatic accent. Cucumber and candied ginger are the garnishes (and potential snacks), while a dusting of chile powder adds a kick to each sip. The Mezcal Mule colors outside the classic vodka-based mule's lines but still offers plenty of familiar flavors for fans of the original. This video file cannot be played. (Error Code: 102630) CLICK PLAY TO SEE THIS MEZCAL MULE RECIPE COME TOGETHER