Beef Stroganoff Ingredients2 tbsp olive oil, divided600 g lean beef strips20g butter1 large onion, sliced250g mushrooms, sliced2 tbsp flour500 ml beef stock150 ml sour cream2 tsp Dijon mustardSalt and pepperChopped chives, for garnish MethodSeason beef strips with salt and pepper. Heat 1 tbsp olive oil in a large skillet over high heat. Scatter the beef […]