I decided I would use tequila as the base for this cocktail, and did a quick google search, which led me to the Guadalajara recipe on Cocktail Quest:
- 2 Tequila
- .5 Fernet Branca
- .5 Agave Nectar
- 2 dashes Xocatle Mole Bitters
The recipe also recommends squeezing the oils from a grapefruit peel, but I didn't have one handy.
It's yummy and a good use of Fernet Branca, should you find yourself with some to spare.