Brown onion and ground beef and drain. Add kidney beans and set aside to cool.
In a separate bowl, mix salsa and mayonnaise, salt and pepper and set aside. Place chopped lettuce in a large bowl.
Add chopped tomatoes, cheese and beef mixture. Top with chips. Pour salsa mixture over top and mix well. After serving place small amount of Catalina Dressing on top and mix well. I usually make my dressing while the onion and beef are cooking and set it aside. I do not add the Catalina Dressing to my other dressing as not everyone likes it. Also, do not add the chips until ready to serve.