Ukrainian Beef Strogonov

3 lb Filet mignon tips

1 c Onion finely chopped

4 tb Butter unsalted

1 1/2 lb Mushrooms small 1/2" or

- smaller 2/3 c Heavy cream

3/4 c Sour cream or plain yogurt*

2 1/4 ts Dijon mustard

2 tb Dill fresh, chopped fine

1 1/2 tb Fresh parsley

2/3 c Beef stock

Salt & pepper to taste 2 3/4 ts Flour

Slice the beef into thin strips approx. 1 1/2" - 2" in length. Heat a large cast iron skillet over high heat and add the meat a few stripos at a time to sear the meat. Remove the meat from the heat and set aside. Reduce the heat in the skillet to medium and melt the butter. Add the onion, saute`, until soft . Raise the ehat to med-high, add the mushrooms, saute;, stir frequently, cook for 15 - 20 minutes. Lower heat to med-low sprinkle in the flour, stir well for 1-3 minutes. Stir in the stock, cream, sour cream, & mustard. Cover, reduce heat to low and simmer for for 5-7 minutes. DO NOT ALLOW TO BOIL! Return the meat to the skillet, mix with sauce, stir in the dill & parsley, and serve.