Chicharrón en Salsa Verde

Both halves of this dish are old and Mexican-everyday. Chicharrón — pork skin rendered and fried until it puffs and crackles — is part of the pork cookery the Spanish brought after the conquest, since pigs were a colonial introduction, and it became cheap, universal food. Salsa verde, ground from tomatillos (a pre-Columbian fruit, husk-tomato, native to Mexico) with green chile and cilantro, is older still. Cooking the crisp rind down in that green sauce is a thrifty, generations-old home and market dish with no recorded inventor or town of origin; its specific beginnings are not documented, which fits a humble taco filling found across the central region.

Straight from the pot the chicharrón has gone soft and yielding, slippery with green salsa, but with a faint memory of its old crunch in the thicker pieces — that half-surrendered texture is what people love it for. The salsa is tart and grassy from the tomatillos, with a clean chile heat and the perfume of cilantro. It is rich, almost gelatinous where the rind has dissolved, so a squeeze of lime and a folded tortilla are needed to carry it. Rolled into a taco it is soft, saucy, and a little messy, the way it should be.

It is a study in deliberately softening a crisp food. Fried chicharrón is almost pure rendered collagen, dry and brittle; dropped into hot salsa it acts like a sponge, absorbing liquid and rehydrating, and its collagen begins to turn back toward gelatin, so within minutes it swells, softens, and thickens the sauce with the fat and gelatin it gives off. The timing is the skill — too brief and it stays tough and dry, too long and it dissolves to mush. The salsa itself is built the Mexican way: tomatillos and green chile are boiled or charred to tame their rawness, then blended, and ideally the puree is fried in a little oil first so it deepens before the rind goes in.