Ritz Cracker Casserole

Brown 1 ½ lbs hamburger and 1 onion; add 1 T vinegar, 8 oz can tomato sauce, salt pepper, 2 cups water
(2 cups grated cheese, 1 small box Ritz Crackers)
Bring to boil. Thicken with ½ cup flour (mixed with 2/3 cup cold water). Simmer 20 minutes. Grease pan.
Line pan bottom with crackers, pour in ½ meat mixture. Set layer of Ritz on that. Add 1 cup grated cheese –
spread evenly. Pour on remainder of meat. Top with crackers. Bake at 350 for 20 minutes. (Put remainder of
cheese on top after 15 minutes.)