1 1/2 lbs. round steak, cut in thin strips
Hot oil
1 c. bottled spaghetti sauce
3 tbsp. brown sugar
3 tbsp. vinegar
1 1/2 tsp. mustard

Brown meat quickly. Remove meat and drain oil. Cook sauce ingredients in same skillet about 2 minutes. Add meat. Heat and stir 5 minutes more. Serve on toasted buns.