Wash the potatoes. Cook in boiling salted water for 15-20 minutes, then peel. In the meantime, clean and wash the radish and cucumber. Cut some cucumber slices and put them aside.
Grate the rest of the cucumber. Cut the radishes, except for one, into fine slices. Cut off the cress briefly. Wash and chop parsley. Mix prepared ingredients, quark and yoghurt. Season to taste with salt, pepper and lemon juice.
Cut the aspic into cubes. Arrange potatoes, curd cheese and aspic with cucumber slices, retained radish and lemon on a plate.