In oblong pan or dish put foil length across pan, leaving foil for overlapping. Butter foil, lay round steak or chicken on foil and cover with Lipton onion mix. Take a large (28 ounce) can of tomatoes and drain some juice. Crush tomatoes over onion soup, then put sliced mushrooms on top. Slice 1 large green pepper over top. Take drained juice from tomatoes and add 2 tablespoons A-1 sauce and 2 tablespoons cornstarch; mix. Add salt and pepper to taste over steak, lay foil over top. Bake at 325 degrees for 2 hours. This makes lots of gravy. Pour over rice or mashed potatoes or noodles.