Tblisi Beef& Mushrooms

-----SPICE MIX----- 1 t Black pepper

1 t White pepper

1 t Red pepper flakes

4 t Salt

4 t Peppercorns

3 t Dry mustard

1 T Paprika

1 t All-spice

-----MAIN INGREDIENTS----- 2 1/2 lb Beef steak 3/4 " thick

12 c Flat noodles

1 T Vegetable oil

8 c Beef stock

4 c Onions chopped

32 oz Sour cream

-OR- 32 oz Plain yogurt