Mexico City and Tlaxcala — a working-class street food tradition dating to at least the early twentieth century; most associated with the bicycle vendors of Mexico City's barrios
Tacos de Canasta — basket tacos — are the essential working-class breakfast and lunch of Mexico City, sold from bicycle baskets by vendors who cycle through the streets before dawn and sell until mid-morning. The name refers to the insulated basket in which the assembled tacos are stacked, wrapped in cloth, and kept warm by the trapped steam of their own cooking. The technique is the inverse of most taco preparation. Rather than serving each element separately and allowing diners to assemble their own, tacos de canasta are pre-assembled: a soft corn tortilla is filled with any of several classic fillings (potato with chorizo, refried beans, chicharrón in salsa, mole), folded, and stacked tightly in the basket. The basket's insulation, combined with the heat of the fillings and a ladling of guajillo-infused lard over the assembled tacos, creates a gentle steam environment that softens the tortillas and melds the flavours together. The guajillo grease is the technique's defining element. Guajillo chillies are simmered in lard with garlic and onion until the lard is deeply flavoured and turned a vivid orange-red. This aromatic lard is ladled over the stacked tacos in the basket, basting every surface and contributing both flavour and the moisture that generates the steam. The result is a taco that is slightly greasy, deeply flavoured, and unlike the texture of any freshly assembled taco. Individual fillings are chosen from the vendor's selection and serve as a form of fast food: a typical order is four or five tacos representing two or three different fillings. Salsa verde is the canonical accompaniment — its acidity cuts through the richness of the guajillo lard. There are no garnishes beyond salsa and the option of pickled jalapeños. The flavour of tacos de canasta comes precisely from their non-freshness — the steam-softened tortilla, the melded filling and lard, the pooling salsa — all elements that a freshly cooked taco would not have.
Soft, warm, and richly larded — steamed corn tortilla, guajillo-infused fat, savoury bean or potato filling, and bright salsa verde acid to cut through richness
The guajillo-infused lard is the flavour carrier — make it carefully and apply it generously over the stacked tacos Stack tacos tightly in the basket to trap steam and maintain temperature Fillings must be dry enough not to make tortillas soggy — potato should be well-cooked and pressed, beans fully fried Assemble immediately before stacking — each taco should be filled and folded within seconds of coming off the comal Serve salsa verde separately; never add it inside the taco before stacking
Line the basket with a plastic bag, then cloth, to retain the lard-generated steam more effectively A thin corn tortilla (not too thick) absorbs the guajillo lard more efficiently and softens better in the basket For home preparation, a covered baking dish with tacos stacked and lard ladled over can approximate the basket method The best fillings for basket tacos are those that benefit from being pressed and warm: frijoles, papa con chorizo, chicharrón en salsa For chicharrón filling, the pork skin must be pre-softened in salsa before filling or it will puncture the tortilla
Using wet or under-cooked fillings that soak through tortillas immediately Not applying guajillo lard over the assembled tacos — without it, basket tacos are simply cold tacos Serving immediately without allowing them to steam in the basket for at least 20 minutes Using flour tortillas, which become gummy when steamed rather than soft and yielding like corn Over-filling, which causes the tacos to burst open and lose their structural integrity under steam pressure