Birria tacos take a little longer to make than your traditional taco, but the flavor and crunch are worth it! Don't be afraid to coat your tortillas with extra sauce as that’s what is going to give it the flavor! Traditionally, these are served as goat tacos, however beef or pork make a great substitute. If you’re feeling adventurous, try using beef tongue.
Preheat the oven to 300 degrees F.
Using a Vitamix or blender, add marinade ingredients. Blend the marinade into a smooth paste. Set aside.
Add avocado oil to a large Dutch Oven over medium-high heat. Season the chuck roast with Himalayan salt and pepper to taste.
In two to three batches, sear the beef. Brown beef on all sides, about 7 minutes per batch. Set aside.
Add the marinade to the Dutch Oven. Add the meat back to the pot along with any juices. Add in the remaining stew ingredients and any bone broth needed to cover.
Cook until the beef is tender, about 3 hours or so.
Once beef is cooked, move it to a bowl. Shred with two forks and set aside.
To make the tacos- Dip a tortilla in the warm liquid from the Dutch oven. Lay the tortilla on a griddle over medium heat and top with some shredded cheese and about 3-4 tbsp. of beef. Fold in half to close. Repeat with 3 to 5 more tortillas (as many as you can fit on the griddle).
Cook the tacos on a griddle until crispy, about 45 seconds per side.
Remove tacos and place on plate. Repeat with remaining tortillas and beef mixture until all are cooked. Serve with braising liquid on the side for dipping as well as any desired garnishes.