London Dry Gin, Rosso Vermouth, and Martha Outlaw’s Liqueur are blended into a Negroni and then aged in oak barrels. After we taste and determine it is worthy to be labeled Barrelsmith, we bottle at full strength, 30% ABV (60 proof). We source our London Dry Gin from an award-winning distillery. Our own Rosso Vermouth is made from California wine grapes and natural flavors. Martha Outlaw created her unique liqueur specifically for craft cocktails destined for aging in barrels. All-natural ingredients, no artificial flavors or colors added.