Wipe the ancho chilies, toast them in a hot pan for a few seconds on both sides, then soak them in hot water for 10 minutes.
Drain, rinse with cold water, remove the seeds and purée with a little water. Cover and refrigerate.
Put the pork hock in a large pot, add just enough water to cover, add the salt and the finely chopped árbol chilies, bring to a boil, then simmer covered until tender.
Debone the tender meat, cut into cubes and return to the pot with the hominy.
Put the cleaned tripe in a pressure cooker, add the garlic, bay leaves and half of the oregano, add enough water to cover and cook under pressure for 35-40 minutes.
After the pressure has released, combine the tripe with the hock and hominy base, refrigerate overnight, and the next day skim off the fat that has solidified on top.
Serve reheated, seasoned with the ancho chili purée, the remaining oregano and red pepper flakes - everyone adds the lime, chopped onion and cilantro on their own plate, with warm corn tortillas.