Preparation

• Heat a large pan to medium heat and add the dried peppers. Dry toast them in the hot pan 1-2 minutes per side, until the skins darken.
• Remove from heat and add the toasted peppers to a large bowl. Cover with hot water and steep for 20 minutes, or until softened.
• While the peppers are rehydrating, heat the olive oil in the same pan to medium heat.
• Add the onion and tomatoes and cook for 5 minutes to soften.
• Add the garlic and cook another 1 minute, stirring.
• Add the cooked onion, tomatoes and garlic to a food processor.
• Remove the softened chilies and add to the food processor, but reserve the soaking liquid.
• Add the seasonings to the food processor along with the vinegar and 1 cup beef stock. Process until smooth.
• Cut the lamb (or beef) into large chunks and add to a large bowl.
• Pour the birria sauce over them and rub it into the meat. Cover and marinate the meat in the refrigerator for 2 hours minimum.
• When you're ready to cook, add the meat with all of the marinade, the chopped roasted tomatoes and remaining 3 cups beef broth to a large pot. Cover and cook at medium heat for 3 hours.
• Serve the braised birria into bowls as a soup, or shred the meat and serve it up onto tortillas as birria tacos.