Email to Judy Garcia Souperburger Source of Recipe Unknown List of Ingredients 1 lb. lean ground beef 1/2 c. chopped onion 10 oz. can tomato soup 1 Tbsp. prepared mustard Hamburger buns Instructions In skillet, brown ground beef with onion; drain. Add soup and mustard. Mix well. Simmer 5-10 minutes to heat through, stirring often. Serve on hamburger buns. Serves 6.