Sherry casks drive much of the character. Ex-sherry casks bring candied orange, dried figs, plums, black cherry and fruitcake, while ex-bourbon casks add brown sugar and maple syrup sweetness. Speyburn’s worm tub condensers give the spirit less copper contact, producing a heavier, more robust base that holds up well to 18 years in oak. Time adds charred cedar, new leather, cacao nibs and warm spice.