This unique spirit is first aged for eight months in American white oak barrels, then finished for an additional 30 days in casks previously used to mature Buchanan's Blended Scotch Whisky.Don Julio Reposado Double Cask blends Mexican tequila craftsmanship with Scottish whisky aging techniques. After maturing in American white oak barrels for eight months, it's finished for an additional 30 days in casks that previously held Buchanan's Blended Scotch Whisky. This process creates a tequila with rich agave flavors complemented by whisky's depth.