Kentucky Owl Mardi Gras XO Rum Cask Limited Edition starts as Kentucky Owl’s 11 year old rye whiskey, which was then finished in 38 freshly emptied Bayou Mardi Gras XO Rum casks. According to the press release, the whiskey was finished for over a year, entering the rum barrels in March and aging through two summers. Is it worth 500 a bottle? Listen to see if the guys think so in the latest Proof Positive Review!