• Heat olive oil in a large skillet over medium-high heat. Season steak with salt and pepper and add to the skillet in a single layer. Brown on all sides and cook until medium-rare, about 2 to 4 minutes (less if you’re using strips of steaks).
• Remove steak to rest on a plate, then add butter to the same skillet. When butter has melted, add onions and mushrooms. Season with salt and pepper, and sauté until onions are soft and mushrooms are tender. Stir in garlic and cook until fragrant, about 1 minute. Add water,
Worcestershire, and beef stock. Bring to a simmer.
• Whisk together cornstarch and water to make a slurry, then pour into the simmering mixture in the skillet. Reduce heat and add mustard and sour cream. Stir until evenly incorporated then add the steak back to the skillet, tossing to coat the meat.
• Serve over buttered pasta and garnish with chopped parsley
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