Peel and finely chop the onion. Drain and dice the beetroot. Peel, wash and chop the potatoes. Heat the oil in a large pot. Steam beetroot, potatoes and onion for about 3 minutes.
3⁄4 Add l water, bring to the boil and simmer for 15-20 minutes.
Wash herbs. Finely chop the chives in rolls and dill. Sort the sprouts, wash hot and drain well.
Puree the vegetables briefly, pour through a fine sieve and pass through if necessary. Add beetroot juice and bring to the boil. Add horseradish and buttermilk to the soup and heat while stirring (do not boil!).
Season to taste with salt and pepper. Arrange soup with herbs and sprouts. Baguette tastes good with it.