Oloroso sherry is without doubt one of the most popular types of sherry used for whisky finishing. It is a powerful Spanish wine known for its deep mahogany color and rich, full flavor. This sherry is made from the Palomino grape and undergoes a lengthy oxidation process, developing its characteristic notes of nuts, caramel, and dried fruit. Billy Walker has used these hogshead sherry casks to create a unique flavor profile. The whisky has acquired notes of coffee beans, raisins, and stem ginger, resulting in a fascinating combination of two beloved drinks.