Mexican Pot Roast Tacos

3 T. extra virgin olive oil
3 lb. Shoulder of beef
Kosher salt and freshly ground pepper
1 large onion
2 cloves garlic, minced
1 28oz. Can crushed tomatoes
3 drive red chilies
1 T. ground cumin
1 T. ancho chile powder
½ bunch cilantro
1 T. red wine vinegar
corn tortillas
shredded romaine lettuce
½ bunch fresh cilantro leaves
fresh limes
1-3 lb. Cotija cheese

1. Heat the olive oil in a heavy-based pot over medium high heat.
2. Season beef shoulder with plenty of salt and pepper; then sear all over until you have a nice brown crust.
3. Add onion and garlic to the bottom of the pot and stir so they caramelize a little.
4. Add tomatoes, chilies, spices and cilantro. Then add about 2 inches of water, cover the pot, and simmer for about 2 hours until the meat is tender and comes apart with little resistance. Add more water as it cooks down, if necessary.
5. Once cooked, break the meat apart with a wooden spoon, season with salt and pepper, and add red wine vinegar.
6. Serve with warm tortillas.