Preheat oven to 325°F and season beef with salt, pepper, and taco seasoning. Roast covered for about 1 hour per pound until tender.
Shred the beef with forks. If resistant, return to oven covered for 30 minutes.
Increase oven to 425°F. Spread beef with juices and roast uncovered 20–25 minutes until crisp.
Id=”instruction-step-4″>4. Mash avocados with citrus juice, zest, salt, and pepper. Fold in onion and cilantro.
Id=”instruction-step-5″>5. Warm tortillas until pliable.
Id=”instruction-step-6″>6. Assemble tacos with guacamole, crispy beef, cheese, and toppings. Serve immediately.
