A bit of a twist on "traditional" taco salad; I will sometimes add a can of black beans (drained and rinsed) and a can of corn (drained and rinsed).
2 ripe tomatoes, diced
1/2 lb. sharp cheddar cheese, diced or shredded
1 large onion, chopped (I use thinly sliced red onion)
1 head iceberg lettuce, chopped (I use a combo of iceberg and romaine)
1 lb. ground beef, browned, crumbled, and drained (I usually season it with a taco seasoning packet)
1 16 oz. bottle of Catalina salad dressing
1 bag of Doritos, crushed
Taco sauce/salsa/sour cream
Combine the tomatoes, cheese, onion, lettuce, and ground beef in a large bowl. Add the entire bottle of salad dressing and mix well. Just before serving, add the Doritos, tossing to combine with the other ingredients. Top each serving with taco sauce or salsa and sour cream.