Do not let the packaging fool you. **Retailer advises either in stock or in route to their location. What does Jameson 18 Year Old Triple Distilled taste like. This blend of two pot still Whiskeys and a single grain is matured in Oloroso Sherry casks and finished in Bourbon wood for 6 months for a complex pot still character. 18 year old whiskey from the world-famous Jameson, built around a blend of two pot-still whiskeys alongside a portion of single grain whiskey. The packaging is wickedly deceiving. The bourbon cask finishing leads to a smooth, vanilla finish, brightened by previous notes of toffee and caramel. Produced in The Midleton Distilleries situated in Midleton, Cork County, Jameson 18 year old has long been considered one of the brightest stars of the range.