Peel and wash the potatoes and celery and cut into large cubes. Peel and dice the onions
Heat 2 tablespoons of olive oil in a large pot. Sauté potatoes, celery and onions in it. Set aside 3 chestnuts, the remaining ones to fry. Deglaze with stock and wine and simmer for about 25 minutes
Cut the remaining chestnuts into thin slices. Heat 2 tablespoons of olive oil in a small pan and roast the chestnut slices in it while turning
Wash parsley, shake dry and chop. Remove the pot from the stove and puree the soup with the blender. Season to taste with salt. Refine with cream, heat up and season again
Pour soup into plates. Garnish with parsley and chestnut slices in oil