Originally Posted by
maviskw
I put a beef roast and a pork roast into a roaster with tight cover, big enough to hold how much meat I have. (I have made up to 10 pounds of meat this way.) Pour mushroom soup over it. From one half can to two cans according to how much meat you have. Then sprinkle generously with Onion soup mix. Cover tightly with foil, put roaster cover on and cook at 250º for 12 hours.
Yes, put it into the oven before you go to bed or very early in the morning. You have the best ready-made gravy you ever tasted.
I just read the post by mac. She (He) says to cover the casserole with parchment to keep the tomato away from the foil. This would be a good idea with my recipe also, as the onion soup sometimes eats through the foil.