Slice the beef into thin strips, then season with salt and pepper. Set aside to allow the flavors to meld.
Peel and finely chop the onion and garlic. Clean and thinly slice the mushrooms.
Heat the vegetable oil in a large skillet over high heat. Sear the beef for 2-3 minutes, until browned. Remove the beef and set aside.
Melt the butter in the same skillet, then sauté the onion and garlic until softened and translucent.
Add the mushrooms and sauté for another 5-6 minutes, until softened and they have released their liquid.
Sprinkle with the flour and stir thoroughly to avoid lumps.
Pour in the beef broth, then stir in the sour cream and Dijon mustard. Bring to a simmer and cook until the sauce has thickened slightly.
Return the beef to the skillet and cook for another 5 minutes, or until the beef is heated through.
Before serving, sprinkle with fresh, finely chopped parsley. Serve over rice, pasta, or mashed potatoes.
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