Peel and wash the potatoes and cut them into thin slices. Heat the oil in a coated pan. Fry the potatoes for 15-20 minutes, turning several times in between
Peel the onion. Finely dice onion and cucumber. Wash the herbs, shake dry and chop finely, except for some parsley for garnishing. Stir the salad cream, yoghurt and cucumber stock until smooth. Stir in the cucumber, herbs and half the diced onion. Season tartar sauce with salt, pepper and sugar
Add the remaining onion cubes to the potatoes and fry for about 5 minutes. Season with salt and pepper. Arrange chicken aspic, fried potatoes and tartar sauce. Garnish with the remaining parsley