Tacos de Cabeza

Tacos de cabeza grow from the same nose-to-tail thrift as lengua and suadero — the whole steamed head was an economical way to feed a crowd, and the cuts of a cow's head each became a named taquería offering. As a category it is firmly a Mexico City and central Mexican street institution, with no single recorded inventor; it took shape within the working-class street and market food of the capital over the 20th century. In the north the related barbacoa de cabeza cooks a whole head in a pit, while the city version is steamed in a vat or pot. The honest framing is a long-standing street staple of whole-head cookery, valued for the variety of textures one animal yields.

A spectrum in one taco. Cachete (cheek) is the richest — soft, gelatinous, almost like braised oxtail; ojo (eye) is silky and yielding; labio (lip) and other connective cuts are bouncy with rendered collagen; sesos (brain) is creamy and delicate. All share a clean, beefy savor without strong gaminess, the steaming having coaxed the cuts to spoon-tenderness. On the tortilla they take only onion, cilantro, salsa and lime — the textures are the show, and the lime keeps the richer cuts from cloying.

A cow's head is almost entirely connective tissue, skin and hard-working facial muscle, so slow moist heat is essential: hours of steaming hydrolyse the dense collagen into gelatin, which is exactly what gives cheek and lip their soft, sticky, melting quality — the gelatin is the texture. Steaming rather than boiling keeps the delicate cuts from washing out and lets each part cook in the humid heat without drying. Chopping to order means the meat hits the tortilla hot and freshly cut, its surface just set. Cook a head too fast and the collagen never converts, leaving the cuts rubbery and tough.