Coarsely chop the beetroot and pickles. Puree with the broth, buttermilk and half of the sour cream. Season to taste with salt and pepper and refrigerate for approx. 1 hour.
Boil eggs hard for about 8 minutes, then let cool. Chop the parsley and walnuts very finely. Peel and quarter the eggs.
Garnish the soup with the remaining sour cream, eggs, parsley and walnuts and serve.
Tip: If you like it a little more liquid, you can use kefir instead of buttermilk and sour cream.