Tiajuana Torte

I've had this recipe a long time. When I was a 7th or 8th grader, an assignment from my home ec teacher was to put together a recipe box with a certain amount of recipes inside. This is one that has been in there since then.

1 lb. ground beef
1/2 onion, chopped
1 (15 oz.) can diced tomatoes
1/2 pkg. taco seasoning
1 (8 oz.) can tomato sauce
corn tortillas
cheddar cheese, grated

Cook hamburger. Add onion and saute until translucent. Add tomatoes, sauce and seasoning. Simmer 15 minutes. In a 13x9 casserole dish, place half of the meat mixture, layer of broken tortillas, layer of cheese. Repeat layers. Bake at 350 degrees for 20 minutes.