|Whole fresh mushrooms||1 Pound, chopped (Caps And Stems Both)|
|Onion||1 Medium, minced|
|Butter/Other fat||2 Tablespoon|
|Dairy sour cream||1⁄2 Cup (8 tbs)|
|All purpose flour||1 Tablespoon|
Simmer mushrooms and onions in butter until mushrooms change color and the onion is a light golden brown.
Combine sour cream and flour, and add to mixture.
Season to taste and continue to simmer until the mixture bubbles up.
The filling should be thick and not runny.
If too thin, add a little flour.
Fill the nalesniki, roll, and brown in butter or bacon fat.