Harviestoun Ola Dubh 21 Years is a masterful stout that gains its unique depth and complexity from aging in 21-year-old Highland Park whisky casks. Based on the characterful Old Engine Oil, this beer is matured for at least six months to absorb the rich flavors of the whisky. The result is a dark chocolate brew with roasted notes and a bittersweet finish, interwoven with subtle whisky nuances. Harviestoun Brewery, which has been brewing high-quality craft beers from the Scottish Highlands for over 30 years, combines its passion for quality here with an innovative aging method that equally delights beer and whisky enthusiasts.