Wash the meat and let it drip off. Peel and slice the onion. Insert bay leaves. Press cloves into the onion. Boil up onion, peppercorns and 1 1/2 litre salted water.
Cover the meat and cook on a low heat for about 2 hours. Peel or clean and wash the vegetables. Celery in sticks, potatoes and carrots in thin slices, cut the leek into strips.
Add the prepared vegetables to the meat and cook everything on low heat for another 20-25 minutes. For the apple-horseradish cream, peel the apples, grate them finely and mix them with a little lemon juice. Peel and grate the horseradish.
Immediately fold under the apples. Whip the cream until very stiff, fold into the mixture and season to taste with a little salt. Remove the boiled beef from the stock. Let it rest for 5-10 minutes. Then cut across the fibre into 1 cm thick slices.
Arrange on the vegetables. Pour some stock over them and garnish with parsley. Serve with apple and horseradish cream.