- rehydrate the dried mushrooms - add them to a bowl filled with hot water and soak for 2-3 hrs - sauté onion, carrots and celery - add fresh mushrooms and cook all for 5-10 min - transfer all the ingredients to a large soup pot and cook on low 20 min
-in a small bowl combine sour cream and flour - add a cup of cooled clear soup to the cream paste; stir well to combine - add the tempered cream back to the stock pot and mix well - cook few more minutes