Heat large saucepan over medium-high heat, add 2 Tbsp butter. Once the pan is hot, sear steak strips until cooked through (approximately 2 minutes per side). Remove steak strips and set aside.
In the same pan, add 2 Tbsp butter, onion, mushroom, and garlic. Cook until tender, approximately 3-4 minutes.
Add flour to mushroom/onion mixture and stir well. Add bone broth, salt, pepper, and thyme. Bring to a boil and then reduce to simmer, allow to thicken while stirring regularly. After about 15 minutes sauce will have thickened.
While this is simmering, cook egg noodles according to package directions.
Once sauce is thickened, add red wine vinegar, Worcestershire sauce, and steak strips to sauce pan. Add sour cream and stir. Allow sauce to cook for another 5 minutes on low simmer. Serve over cooked rice noodles.
Recipe Note
This recipe can be made with either beef or bison bone broth!
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