In a large skillet over medium heat, brown ground beef until no longer pink, breaking it up as it cooks. Drain the grease and return the meat to the skillet.
Add in taco seasoning and salsa and continue to cook over medium heat for another 5 minutes. In a large bowl, place chopped lettuce, diced tomato and diced onion.
Add in taco meat and catalina dressing. Stir to fully coat. Fold in crushed doritos chips just before serving.