As you might guess from its name, this very specialized bar serves mezcal, along with a good selection of tequilas and a couple of Mexican craft beers from Day of the Dead. There's no actual drinks menu, and it's too dark in here to read one anyway, but the friendly bartender will give you advice on what to try. Mezcal is priced from Y1000 a glass and tequila from Y800, and there's no table charge.
The very dimly lit bar is relaxed and comfortable, and it stays open until 3am most nights. Background music is modern Mexican and Latin American, played at a volume that doesn't impede conversation. The food menu is very limited, so you should probably eat before you visit.