Warm the tortillas according to package instructions. I usually do this on the stovetop and warm up for about 2 minutes on each side. Make sure to flip with a spatula or tongs. When the tortillas are warm, assemble the tacos.
Add the cut up carne asada, top with salsa, and avocado slices. Garnish with cilantro and chopped onion. Serve with lime wedges.
