Soupe de Châtaignes (Chestnut Soup)

Once, wherever chestnut trees grew, the nuts were important food for the poor, and yet their taste is luxurious. This chestnut soup, one of my favorite of all soups, presents its main ingredient beautifully. It happens to be French, although chestnut soups are made in many places. Chestnuts excel only during the couple of months of their fall season, an…