Krewella. Jameson is produced from a combination of malted milk and un-malted or "green" Irish barley, all sourced from inside a fifty mile radius around the distillery in Cork, Ireland. The barley is dried in a closed oven by clean-burning anthracite coal to preserve its flavor. Like most Irish whiskey, Jameson is triple distilled for optimum smoothness. The philosophy is balance, guaranteeing that no one flavor element overpowers another. The end result is a sweet-tasting hard liquor.