1 lg. onion, sliced
2 tbsp. butter
1 lb. thinly sliced roast beef
1 oz. shredded Swiss cheese
6 (6 inch) French bread rolls
Au Jus mix or beef broth to make brown gravy

Saute onion in butter. Remove onion from skillet. Add roast beef to skillet. Heat thoroughly. Place beef evenly divided on bread roll halves. Sprinkle with cheese and cover sandwiches. Serve with a cup of beef broth thickened with corn or potato starch to gravy consistency.