Sprinkle steak with salt and pepper; set aside.
Combine onions, garlic, thyme, oil, parsley, lemon peel and bay leaf. Pour over meat; turn meat to coat thoroughly. Marinate for 2 hours in refrigerator.
Remove meat from marinade; strain liquid and set aside. Brown bacon in a skillet over medium heat; add strained marinade solids.
Toss meat with flour; add to bacon mixture. Stir in marinade juices and bring to a boil. Lower heat, cover and simmer for 1 1/2 to 1 3/4 hours, or until meat is tender. Add sliced mushrooms during the last 10 minutes of cooking.
Serve over prepared noodles.
Servings: 6 to 8