Step 1 Brush a large, non-stick frying pan or chargrill with half the oil and heat over a medium-high heat. Add steaks to pan and cook for 2–3 minutes on each side, or until cooked to your liking. Remove from heat and cover with foil to keep warm.

Step 2 To make mushroom sauce, brush a medium non-stick frying pan with remaining oil and heat over a medium heat. Cook mushrooms, stirring, for 4–5 minutes, or until browned. Sprinkle flour over mushrooms and cook, while stirring constantly, for 1 minute. Remove from heat.

Step 3 Combine stock, sour cream and Worcestershire sauce in a jug. Gradually pour mixture into frying pan, stirring until well combined. Return to heat and bring to the boil, stirring constantly. Reduce heat to low and simmer for 2–3 minutes, or until sauce thickens. Divide steaks among plates. Pour over sauce and sprinkle with chives. Serve with potatoes and vegetables.