Peel, wash and dice the potatoes and celery. Peel and finely dice the onion
Heat the fat. Sauté onion, potatoes and celery in it, season. Deglaze with 1 l water. Bring to the boil, cover and cook for about 25 minutes. Puree the vegetables in the broth. Add 100 g cream and bring to the boil. Season soup with salt, pepper and 2-3 tbsp. horseradish to taste
Cut salmon into fine strips. Wash the chives and cut into small rolls. Whip 100 g cream until half stiff and mix with 1 tablespoon horseradish. Serve soup with horseradish cream and salmon strips. Sprinkle chives over it