Fairly sweet, but tasty, if you don't mind the sweetness. I used SelvaRey White Rum and Disaronno.

Simple but nice if you're in the mood for mint & chocolate.

Lemon bitters in place of the lemon zest twist is worth trying, imho.

Very interesting cocktail! The bitterness from the Amaro Montenegro really helps balance the sweetness of the Jack Daniel's & orgeat.

FWIW, Hayman's London Dry Gin seemed to work well for me.

Has this been discontinued? Not easily finding anything about it online...

I did not like this in most drinks that I tried calling for Calvados; most of the time it seemed to provide a very unpleasant bitterness... When I tried a little bit on its own, diluted, with an ice cube, I ended up getting a not-so-pleasant "cat urine" note... However, this ended up working very well (better than Avallen) in the Manicure (https://www.diffordsguide.com/cocktails/recipe/2820/manicure) with Johnnie Walker Black & Drambuie...

Coming back after using this drink to help finish off a bottle of Berneroy Fine Calvados: making this with the Berneroy, Johnnie Walker Black, & Drambuie resulted in a great equal-parts drink, with relatively easy to find ingredients, if you're in the mood for a drink with a decent amount of "smoke". I'd maybe rate it more like a 4 on the sweet/dry/sour scale, but it still felt well-balanced by smoke/herbal/bitter components.