Tacos de Canasta (Mexico City — Steamed Basket Tacos, Guajillo Grease)

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.