Wow, just wow. Just did this with Ukiyo Japanese Yuzu Gin, Jeff Morgenthaler's homemade Lime cordial, and adding 5 drops of The Japanese Bitters Yuzu.
Absolutely fantastic.

Definitely in the hall of fame.
I would typically add 5 drops of Bob's Abbots bitters, and tend to favour an Orange zest twist instead of Maraschino cherry.
For those of you who like to explore alternatives:
40ml Rittenhouse Rye,
20ml Amaro Braulio,
15ml Chartreuse Jaune,
2 Dash Peychaud's,
5 drops Abbots bitters,
Orange zest twist,
Stir, strain in rocks glass.
In this one no need for the Absinthe rinse as Amaro Braulio imparts a reminiscent taste.

Just did this one replacing Fernet with Ferro China del Moro (a Calabriese FerroChina that has the peppermint and liquorice taste of Fernet Branca + the ferrous aftertaste typical of Ferrochina).
Absolutely stunning!