Place pork pieces in a glass bowl and set aside. Bring a small pot of water to boil, add the dried chiles, tomato, garlic and onion and simmer over low heat. Allow the chiles to rehydrate before removing, the onion and tomato will take longer. After it has softened, remove the skin from the tomato. Place the soften onion, garlic, tomato and chiles in a blender. Add a little salt, the vinegar and blend until smooth. Taste and adjust seasoning if desired. Pour the chile marinade over the pork, stir until well combined and refrigerate overnight or for at least 30 minutes.
While the meat is marinading chop up the toppings. The next day, or after 30 minutes, heat some oil and cook marinated pork until cooked through. Serve with corn tortillas, finely chopped onion and cilantro, lime or lemon wedges and your favorite salsa.
Notes
-- I marinated the pork overnight but you can do a minimum of 30 minutes or longer.
-- Instead of pork, chicken or turkey may be used.
-- Chiles de arbol are very spicy, make milder by cutting down and adding another chile ancho -- which is very mild.
-- The sauce marinade tastes wonderful and it can also be used for other cooking purposes.
Recipe by Spicie Foodie ™ at https://www.spiciefoodie.com/2013/08/06/pork-or-chicken-tacos-cooked-in-ancho-chile-and-chile-de-arbol/