For the sauce I used cooked, frozen white mushrooms.

The cooking of the sauce. In a pot poured oil"Oleyna" and sifted flour. A little massirovala it and gradually poured the water. Put salt and sugar. When the water began to boil I added the sour cream and mushrooms. The sauce has thickened. At the end pour turmeric for beautiful color. While cooking the sauce you need to stir constantly, to not burnt.

Turned out very tasty mushroom sauce