For a taste of the north, head to this excellent Monterrey-style taco restaurant. It's buzzing with hip locals after a night out but a queue forms by even 10pm. The 肠丑颈肠丑补谤谤贸苍 (fried pork fat) is the specialty here and different to the usual Mexico City offering.
The creamy costra (toasted cheese) quesadilla is also special. Unusually, you order and pay at the entrance, but once seated you are free to add more onto a new bill.