Step 1: Prepare the Marinade In a large bowl, whisk together lime juice, olive oil, black pepper, garlic powder, onion powder, cumin, salt, and paprika until well combined.

Step 2: Marinate the Meat Slice the steak against the grain into 1/4-inch strips. Add to the marinade, ensuring all pieces are well coated. Cover and refrigerate for at least 2 hours, preferably overnight.

Step 3: Prepare the Vegetables Slice bell peppers and onion into strips of similar thickness to the meat. Set aside.

Step 4: Make the Tableside Guacamole Score avocados in a crosshatch pattern and scoop into a bowl. Add jalapeño, onion, lime juice, and cilantro. Mash to desired consistency, leaving some chunks. Season with salt and pepper.

Step 5: Cook the Fajitas Heat cast iron skillet over high heat until smoking. Remove meat from marinade and cook in batches, about 2-3 minutes per side. Remove and rest.

Step 6: Cook the Vegetables In the same skillet, add oil and cook peppers and onions until slightly charred but still crisp, about 4-5 minutes.

Step 7: Serve Return meat to skillet with vegetables for final sizzle. Serve immediately with warm tortillas and accompaniments.