Frijoles con Espinazo y Hierba Santa

This dish is from the Sierra Norte de Oaxaca, from the mountain kitchens of Zapotec and Chinantec towns where the fog sits on the ridgeline and the cooking is slow. Frijoles con espinazo is not a recipe you find in Mexico City restaurants. It's a recipe you find in a clay olla on a wood-burning stove in Ixtlan de Juarez or Guelatao, the kind of pot a senora puts on in the morning and serves in the afternoon.

The espinazo, pork spine, is the cheapest cut at the carniceria. Bones, cartilage, marrow, a little meat clinging to the vertebrae. That is the point. The marrow dissolves into the bean broth over three hours and gives it a body and richness that no boneless cut can replicate. You are not paying for meat here. You are paying for what the bones release. This is the economy of cooks who waste nothing and know that the best flavors hide in the parts other people throw away.

Hierba santa is what makes this version Oaxacan. Not epazote. Hierba santa. They are not the same plant, not the same flavor, not interchangeable. Hierba santa, hoja santa, Piper auritum, whatever you call it, has a deep anise note with green pepper underneath, almost like a cross between basil and black licorice. Epazote is sharp and medicinal. If someone tells you to swap one for the other, they haven't cooked with either. The leaves go in torn, at the end, so the heat pulls out the oils without cooking away the fragrance. That last ten minutes changes everything.

My mother didn't make this dish. She was jalisciense and her beans were pintos with chile de arbol. But I ate this for the first time in a market fonda in Ixtlan on my Sierra Norte trip, from a woman who served it in a clay bowl with a stack of tortillas and said nothing except the price. One spoonful and I understood why the cooks up there guard their recipes. I wrote it down that afternoon. Saber cocinar es saber vivir.