Combine 1/2 cup flour with the salt and pepper and toss with beef cubes to coat thoroughly. Place in crock-pot. Add green onions and drained mushrooms. Combine with beef broth, Worcestershire sauce and tomato paste or ketchup. Pour over beef and vegetables; stir well. Cover and cook on LOW setting for 7 to 12 hours. One hour before serving, turn to HIGH setting. Make a smooth paste of red wine and 3 tablespoons flour; stir into crock-pot, mixing well. Cover and cook until thickened. Serve over hot buttered noodles. 8 to 10 servings (about 3 quarts).