Remove the Trader Joe's Carne Asada from the refrigerator 10-15 minutes before cooking to bring it closer to room temperature for even cooking.
While the meat rests, prep all toppings: dice the white onion, chop cilantro, slice avocado, cut limes into wedges, and warm the tortillas just before serving.
Preheat a cast iron skillet over high heat for 3-5 minutes until screaming hot, then add avocado oil and swirl to coat the bottom.
Open the package and lay the beef slices in the hot pan in a single layer, working in batches if needed to avoid overcrowding.
Cook for 3-4 minutes on the first side without moving to develop a dark crust, then flip and cook 2-3 minutes more until browned and the internal temperature reaches 145°F (63°C).
Transfer the cooked meat to a cutting board, tent with foil, and let rest for 5 minutes to redistribute the juices.
Chop the rested carne asada into bite-sized pieces about ½-inch (12mm) against the grain for the most tender texture.
Assemble tacos with warm tortillas, generous piles of carne asada, diced white onion, fresh cilantro, pico de gallo, avocado slices, and a squeeze of lime.