There is a lot of handwaving about amounts in this recipe -- I watched my Mom make it to get a feel for it. It is really good!
This is Grandma's Casserole (that's the only name that I have ever seen)
1 med onion, diced
Butter
1 can tomato sauce
elbow macaroni (uncooked)
bacon
-- Saute the onion in the butter. Pour into a greased (buttered) 9" square pan and spread around.
-- Cover the onions with uncooked elbow macaroni -- a good solid 1 layer deep.
-- Pour the tomato sauce over the macaroni, then add enough water so that the macaroni floats a bit.
-- lay strips of bacon over the mixture
-- Bake 350 until all the liquid is absorbed and the bacon is cooked..
-- If desired, cook up some extra bacon.