Peel 1 onion. Clean and wash the greens. Roughly chop everything. Bring to the boil with a good 2 l water, peppercorns, cloves and bay leaf in a large pot. Wash and add the meat, cover and let it simmer for about 2 hours
Peel and wash the potatoes and carrots. Finely dice the carrots. Clean and wash spring onions and cut into large pieces. Peel and finely dice 1 onion. Wash the chives, cut into small rolls
Remove the meat and keep warm. Sieve broth, measure 3/4 l. Add potatoes and salt to the remaining stock, cook for about 20 minutes. Add carrots, peas and spring onions and cook for about 5 minutes.
Heat the fat in a pot. Sauté the onion in it. Sprinkle with flour and sauté briefly. Add milk and 3/4 l stock. Bring to the boil and simmer for about 5 minutes. Season to taste. Mix egg yolk with some hot sauce, then stir into the rest of the sauce (do not boil any more!). Halve the sauce. Stir chives under one half and horseradish under the other half. Arrange the boiled beef with bouillon vegetables and sauces. Garnish if necessary