Procedures

1. 1

   Pour the oil into a large Dutch oven set over medium heat. When warm, add the minced onion, leek, carrot, and celery. Cook, stirring occasionally, until the vegetables soften but don't brown.

2. 2

   Add the lentils, stir well, and then pour in the stock. Bring to a boil over high heat, and then reduce heat to maintain a simmer. Cook until the lentils are very soft, about 40 minutes. Add the chestnuts and simmer for 20 more minutes.

3. 3

   Carefully puree the soup in a blender. (You'll probably have to do this in batches.) When done, return the soup to the pot to warm it back up. Season to taste with salt and pepper. Serve with a sprinkling of parsley and a drizzle of heavy cream.