I used Bourbon (Maker's Mark) and Cream Sherry (Lustau). Outstanding! I will try different Whisk(e)ys in the future. Any other recommendations with the combo of Whisk(e)y and Sherry?
I didn't have dark chcolate at home and accompanies the drink with a pack of Toffifee (https://en.wikipedia.org/wiki/Toffifee) - caramel cups containing nougat, caramel and a hazelnut, topped with a chocolate button. I don't know about the availability of it outside Central Europe though. This was the perfect match. Of course you will largely exceed the nutrition value given here :-)
Amazing drink, although it took me three sips to fully appreciate it. I used Ypióca Reserva, an aged, smokey Cachaça. The recipe says 'no garnish' but a dried lemon wheel may fit very well.