Love this cocktail, been making it for years. I like an Islay or a smokey blend and a London Dry gin. My best so far was aging Ardbeg Wee Beastie in a TEN-30 rye barrel after I'd used the barrel to age Roku gin. Islay finishing in a barrel previously used for gin and rye, combined with Citadelle and Dolin Dry (15ml of each, 60ml of gin) is money.