Peel and chop the potatoes and cook in salted water for about 20 minutes. Wash parsley, marjoram and basil, shake dry. Put 2 stalks of marjoram aside for garnishing. Pluck the leaves from the stalks.
Cut cress from the bed. Finely puree the sour cream, curd, milk, half of the cress and herb leaves, season to taste with salt, pepper and a little sugar.
Put the eggs in boiling water and boil them for about 8 minutes until soft. Drain the potatoes. Quench eggs, peel and possibly halve them. Arrange potatoes, eggs and herb sauce on plates, garnish with remaining marjoram and cress.