Season the beef chuck with sea salt, black pepper, garlic powder, and ground cumin.
Heat avocado oil in a pot over medium-high heat and sear the beef until a dark crust forms on all sides.
Stir in the tomato paste, dried oregano, and the whole dried guajillo chili, then pour in the beef broth.
Cover and simmer on low for 2 hours until the beef is tender and the liquid has reduced into a concentrated flavor bomb.
Remove the softened chili and a small amount of broth, blend until smooth, and return it to the pot to thicken the consommé.
Shred the beef with two forks and briefly dip the corn tortillas into the top layer of the savory broth.
Crisp the dipped tortillas in a hot pan, fill with the shredded beef, and fold into tacos.
Serve the tacos immediately with a side of the rich consommé, topped with diced onion, cilantro, and fresh lime.