The classic filling needs no stove: chicharrón, panela cheese, cecina and nopales picked up at the market.
Tacos assembled at tianguis stalls from ready-to-eat market ingredients, with fresh tortillas, onion, cilantro and salsa, sometimes with barbacoa or avocado.
Why it's made this way: They are listed among the State of Mexico's traditional antojitos, named after the market 'plaza' where the ingredients are bought and eaten on the spot.