Eleven months out of the year, Boilermaker occupies the corner of First Avenue and First Street in Manhattan’s East Village—but during the holidays, the bar tosses on the tinsel and becomes Sippin’ Santa’s Surf Shack. This drink from the shack’s inaugural year became an unexpected favorite, matching the tartness of fresh grapefruit juice with the robust flavors of Branca Menta and chocolate syrup. “It’s silly, but people get a kick out of it,” says Sippin’ Santa’s Samuel Gauthier.