Vienna boletus

Cleared mushrooms, caps cut in half, lengthwise Stipe. In a pan put the butter, sour cream, onion cut into rings, parsley, fruits of nutmeg, salt and pepper. All heat up, add mushrooms, simmer for 20 minutes, then add the whipped and salted egg yolk, stir and cook for a few minutes at a lesser temperature must not boil. Serve immediately.
Specyfikacja
Boletus 500g/20oz
Butter 50g/2oz
Onion 25g/1oz
Parsley 25g/1oz
Nutmeg 1 teaspoon/5g
Salt 1 teaspoon/4,8g
Pepper 1 teaspoon/4,8g
Yolks 1
Soured cream 50ml/17oz