Just got sprung on me. The host going Mexican (not Tex-Mex) and is starting with "tequila cocktails and beer". I need to bring a cocktail, so I want something interesting (no Margaritas), no beer -- something unexpected so I don't duplicate her.
I had this in Mexico, but it's not very authentic:
Akumal Ginger "Martini" (hey, it wasn't my name)
2 oz Gin
3/4 oz Cointreau
1/2 oz Gran Gala
1/2 oz fresh grated ginger
1 oz Lime
I wouldn't mind something challenging, although Chartreuse, Benedictine, Campari, and other amari don't seem too Mexican to me. Maybe something like Averna for the spice?