Soft Carne Asada Tacos Yield: 12 1 (1 pound) boneless cut of beef 12 corn tortillas, warmed 1 medium sweet onion, finely chopped 2 medium tomatoes, finely chopped 2 cups shredded lettuce Fresh salsa Charcoal broil the filet. As it is getting done, warm the tortillas on dinner plates or wrapped in foil in a 350 degree F oven. Thinly slice the beef and place in bowl. Place the onion, tomatoes, lettuce, and salsa in separate bowls. Place the tortillas in a napkin-lined basket. Assemble the tacos by placing a layer of meat in a tortilla, then layers of onion, tomatoes, lettuce and salsa.