Mushrooms are sorted out, washed and soaked in cold water for 3 hours. After the mushrooms washed again. The water in which soaked mushrooms we filter, and again pour the mushrooms, cook until tender without salt. Boiled mushrooms and finely chop cool. Cut the onion finely and passeruem on the butter or margarine, add the mushrooms. All mix thoroughly and fry for another 5 minutes. Flour breed a part of the warm broth. We connect with the remaining broth. Cook for 15 minutes. Add salt to taste. In the finished soup add the onions with mushrooms, boil for 15 minutes. The sauce dressed with butter.