For extra complexity, The Jasper partner and bartender Thomas Leggett split the base of this cocktail between rum and whiskey. "I really like the dustiness and age of the whiskey with the richness of the Demerara rum," he says of the pairing. "I’ve also always loved PX sherry and coffee together, and this is a fun way to get these flavors in a spirit-forward, Old Fashioned-style drink."