Slice the beef tenderloin into thin strips, season with salt and pepper. Heat the olive oil in a skillet over high heat, and sear the beef for 2-3 minutes, then remove from the skillet and set aside.
In the same skillet, sauté the finely chopped onion and garlic, then add the sliced mushrooms and bell pepper. Cook for 5-7 minutes, until the vegetables are softened.
Stir in the tomato paste and mustard, then add the sour cream and heavy cream. Stir until smooth, and season with salt and pepper to taste.
Return the beef to the skillet, and cook for 3-4 minutes, until the beef is heated through and the flavors have melded.
Sprinkle with fresh, chopped parsley, and serve hot. Serve with cooked rice or wide egg noodles.
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