The name comes from Nahuatl, and the stuffed-masa format is one of the pre-Hispanic antojitos that survived the Spanish conquest with its shape and fillings largely intact.
Blue or white corn masa is stuffed with mashed fava beans, beans, or requesón cheese, shaped into a thick oval, and griddled until the outside crisps, then topped with nopales, salsa, cheese, and onion. Market griddle stalls across Mexico City and the surrounding valley cook them fresh to order.