1 1/2 pounds pork tenderloin, cut into 1/3-inch cubes
1 medium white onion, chopped
2 tablespoons cider vinegar
5 tablespoons minced cilantro
3 tablespoons extra-virgin olive oil
1 cup shredded mozzarella cheese
Sixteen warmed 6- or 8-inch flour or corn tortillas, mashed avocado, shredded or leaf lettuce, salsa and lime wedges, for serving
In a large bowl, mix the ancho powder with the salt, oregano, cumin, pepper, cinnamon and allspice. Add the pork, onion, vinegar and 1/4 cup of the cilantro and mix well.
Heat the olive oil in a large skillet. Add the pork and stir-fry over moderately high heat until browned outside and just cooked through. Transfer the pork to a colander to drain, then sprinkle with the cheese and the remaining 1 tablespoon of cilantro. Transfer the pork to a serving bowl and serve with the warmed tortillas, mashed avocado, lettuce, salsa and lime wedges.