This stroganoff features mushrooms instead of noodles.
Slice the beef thinly.
Prepare and slice the onions and mushrooms.
Melt butter in a pan and sauté the beef.
Add onions and mushrooms and cook together.
Add flour and mix well.
Pour in beef broth and Worcestershire sauce, then bring to a boil.
Add sour cream and mix over low heat.
Season with salt and black pepper to taste.
Serve with warm rice or pasta.