Made this using the dry shake approach and felt that actually it wasn't as good. Liquid less creamy and colder which contrasted with the foam less favourably. Will revert to standard Difford reverse dry shake from now on for sours. Still a tasty tipple of course!
Perfectly nice, but lacked depth and complexity for us. We tried it with an Angostura stripe, and that helped a bit, but probably we would prefer some variant with herbal or bitter notes to give it more depth.
Wow, this is ingenious. My favourite way to enjoy Fernet. The Chartreuse amply handles and softens the Fernet intensity, and the result is more than the sum of their parts. Surely a modern classic contender.