Earthy and velvety, this sumptuous chestnut, leek and mushroom soup is both rustic and elegant. And perfect for fall and winter holidays. It can be dressed up with a dollop of creme fraiche and shaved truffles -- or keep it simple and finish with a sprinkling of fresh chopped chives.
Melt butter in a 4-quart heavy saucepan or soup pot over medium heat. Add celery, carrots, leeks and mushrooms and cook until softened, about 10 to 12 minutes. Deglaze the pan with wine and continue cooking for 2 to 3 minutes more.
Add the thyme sprigs, bay leaf and chicken broth and bring to a boil. Reduce heat and simmer covered for 20 minutes. Add the chestnuts and Madeira and simmer for 5 more minutes.
Remove the thyme sprigs and bay leaf. Transfer the soup to a blender or food processor and puree until smooth. Return to the saucepan/soup pot. Stir in cream, cloves, truffle oil and salt and pepper to taste.
To serve: Ladle the soup into bowls topped with chopped chives. Or, top with a dollop of crème fraiche and a few grates of fresh truffle.