1 head lettuce
2 chopped tomatoes
1 chopped onion
2 c. shredded Cheddar cheese
2 lbs. hamburger, browned and cooled
1 lg. bottle Catalina Salad Dressing (I use low calorie)
1 lg. bag Nacho Doritos

Mix first 5 ingredients together. Pour on salad dressing and chill in refrigerator for a few hours or overnight. Put Nacho's on right before ready to serve or the chips will be soggy.