1 lb. hamburger
1 pkg. taco seasoning
1 pkg. taco shells, hard
8-12 oz. shredded cheddar cheese
1/4 to 1/2 c. chopped onion
1/4 c. water

Brown meat and onion. Add taco seasoning, tomato sauce, other seasoning and water. Layer meat, cheese, broken taco shells in casserole, ending with cheese. Bake at 325 degrees for 20 minutes. Cut and serve. Top with shredded lettuce and chopped tomato.