Bourbon Finish Bushmills single malt finished in hand selected double charred American oak barrels and blended with smooth triple distilled Irish grain whiskey for fresh wood and vanilla 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 double charred American oak barrels and smooth triple distilled Irish grain whiskey for fresh wood and vanilla flavours.