Sear the beef

• Slice the beef into strips.
• Sear in a hot pan until golden, then remove and set aside.

Sauté onion and mushrooms

• Sauté the onion in butter in the same pan.
• Add the mushrooms and garlic and cook until softened.

Build the sauce

• Sprinkle the flour over and warm it through.
• Pour in the broth and cream.
• Stir in the Worcestershire sauce and mustard.

Simmer the stroganoff

• Return the beef to the pan.
• Season with salt and pepper and simmer until the sauce thickens.

Serve

• Serve the stroganoff with mashed potatoes.