Tenderized beef round steak is cut into thin strips to make this easy stroganoff recipe so much more tasty than the "hamburger" stroganoff that is popular with so many. Give this recipe a try. You and your family will look forward to the next time you make "that great beef stroganoff!" This dish is best when prepared early in the day, allowing flavors to marry. Reheat and add the sour cream a few minutes before serving.