Lightly coat tenderloin pieces with flour and salt and pepper.
In a large saucepan, saute beef in butter with onions, mushrooms and garlic until meat is browned and onions and mushrooms are tender.
Add Worcestershire sauce and beef broth and cook over medium heat for 10 - 15 minutes.
Stir in sour cream and wine and heat for about 5 minutes.
Serve over hot cooked noodles.
Beef Stroganoff is real comfort food.
The tender beef and gravy has a wonderful flavor that is traditionally served over noodles.
Use the wide egg noodles rather than thin pasta-type noodles.
If you don't like noodles, then you can serve this dish over rice.