Peel and wash the horseradish. Scrape off some thin curls with a potato peeler. Finely grate the rest of the horseradish. Mix sour cream, 2 tablespoons horseradish and cream. Season to taste with salt and let it soak through.
For the marinade, mix vinegar with a little salt and pepper and add oil. Wash and peel the celery and cut into fine strips on a vegetable slicer. Mix with half of the marinade.
Beetroot wash, peel and also slice into strips. Turn in remaining marinade. Wash the sprouts and let them drip off on a sieve. Clean and wash spring onions and cut into rings. Wash and quarter apples and remove the core.
Cut the apple quarters into thin slices. Wash parsley, dab dry and chop except for a little bit for garnishing. Arrange celery, beetroot, apples and spring onions in small heaps on plates.
Sprinkle with sprouts and horseradish curls and garnish with parsley. Add horseradish sauce sprinkled with parsley and the rest of the grated horseradish.