Score the chestnuts crosswise with a sharp knife and roast them in a preheated oven (electric cooker: 200 °C/ circulating air: 175 °C/ gas: level 3) for approx. 15 minutes. Remove, let cool slightly and peel so that the inner skin is also removed. Set two chestnuts aside
Peel and wash the potatoes and celery and cut them into chestnut size. Peel and halve the onion and lard with 2-3 heads of cloves. Put 2 tablespoons of olive oil in a large pot, heat up. Sweat chestnuts, potatoes, celery and onion in it. Deglaze with stock and wine and simmer for about 25 minutes
In the meantime, heat 4 tablespoons of oil and 2 clove heads for 2-3 minutes until the oil has taken on the smell of cloves. Cut the remaining chestnuts into thin slices. Heat 1 tbsp. oil in a small pan and roast the chestnut slices in it while turning
Remove the pot from the stove and remove the onion. Puree the chestnuts, potatoes and celery with a hand blender, season to taste with a little salt and crème fraîche
Pour soup into preheated cups. Sprinkle with clove oil, garnish with roasted chestnut slices and thyme