Ingredients
Method
- Slice the beef against the grain into thin strips. Slice the mushrooms, chop the onion, and mince the garlic so everything is ready before you start cooking.
- Heat 1 tablespoon of butter in a large skillet over medium-high heat. Sear the beef in batches until browned, then set aside. Do not overcrowd the pan.
- Add another tablespoon of butter to the pan. Cook the onion for 3 to 4 minutes until softened, then add the mushrooms and cook until golden. Stir in the garlic and cook for 30 seconds until fragrant.
- Sprinkle the flour over the mixture and stir for 1 minute. Pour in the beef broth, Worcestershire sauce, and Dijon mustard. Simmer for 3 to 4 minutes until slightly thickened.
- Reduce the heat to low and stir in the sour cream until smooth. Return the beef to the pan and warm through. Season with salt and black pepper to taste.
- Serve over hot egg noodles or rice. Garnish with chopped parsley and serve right away.
Notes
Keep the heat low when you add the sour cream so the sauce stays silky and never curdles. Full-fat sour cream gives the best texture.
Sear the beef in batches and give each strip space in the pan. Crowding steams the meat instead of browning it, and browning is where the flavor lives.
Leftovers keep up to 3 days in the fridge. Reheat gently over low heat and never boil, or the sauce can split.