Slice All Mushrooms About 1/4 Inch Thick. Saute Along With Onion And Garlic About 5 Minutes. Add Salt, Pepper, Nutmeg And Lemon Juice, Cook 2 Minutes. Transfer Mushrooms To Soup Pot. Deglaze Pan With Water To Enrich Soup. Sprinkle Mushrooms With Flour, Cook And Stir A Few Minutes. Add Stock, Deglaze, And Bay Leaf. Cook Until Richly Flavored, 15-20 Minutes. Discard Bay Leaf, Add Cream, Heat Through, Taste, Adjust Seasonings. Serve Topped With Chives.