Torta de Pierna Adobada Oaxaqueña

This is an Oaxacan torta. Not a Mexico City torta, not a Guadalajara torta. Oaxaca has its own architecture for a sandwich, and the difference starts with what goes on the bread before the meat ever touches it: asiento.

Asiento is the dark, concentrated sediment left at the bottom of the pot after rendering pork lard. In the Central de Abastos market in Oaxaca city, the señoras sell it in small plastic bags next to the blocks of manteca. It tastes like pork reduced to its most honest form: smoky, deeply savory, a little bitter at the edges. You spread it on the bolillo the way other cooks spread butter, and it soaks into the crumb and stains it gold. Without asiento, you have a sandwich. With it, you have a torta oaxaqueña. La cocina no es decoracion, es trabajo, and asiento is the proof of that work: a byproduct that became a signature.

The pierna is pork leg braised in an adobo built on chile guajillo, chile ancho, and chile pasilla oaxaqueño, the smoked chile from the Mixe region that puts this version on the map of Oaxaca and nowhere else. Cumin, cloves, garlic, oregano, a splash of vinegar. The meat goes into a covered pot in the morning and comes out in the afternoon, tender enough to shred with two forks. The adobo stains the pork a deep burnt orange that bleeds into the bread when you build the torta. That color is guajillo. There is no substitute.

I learned this torta from a señora at a tortería near the Mercado 20 de Noviembre who had been building them since before I was born. She layered everything in a specific order: asiento on the bottom bread, then frijol negro refried with hoja de aguacate, then pierna pulled into shreds, then quesillo stretched into long strings, then avocado, then the top. I asked her why that order. She said: 'Porque así se hace.' I wrote it in my notebook exactly as she told me. Asi se hace y punto.