Anthony Keels, bar manager at Verbena in San Francisco, serves up a cocktail made with barrel-aged, dark gin. Keels calls this gin a game-changer. Stacy Adimando for NPR hide caption toggle caption Stacy Adimando for NPR The Salt It's Brown, It's Barrel-Aged, It's ... Gin? December 5, 2014 Barrel-aged gin resembles young whisky in color and flavor. It's quickly becoming the new darling of distillers and craft bartenders across the U.S.