Rum Finish Bushmills single malt finished in hand selected Caribbean rum casks and blended with smooth triple distilled Irish grain whiskey for subtle fruit and dry spice flavours Granted its licence to distil in 1608, Bushmills is the oldest licensed whiskey distillery in the world. This whiskey is a blend of Bushmills single malt finished in hand selected Caribbean rum casks and smooth triple distilled Irish grain whiskey for subtle fruit and dry spice flavours.