Peel the potatoes and cook them in salted water. Hard boil the eggs. Peel the cucumber, cut the cucumber and tomatoes into pieces. Mix the quark in a large bowl and dilute with whipped cream and oil until the quark has a creamy consistency. Stir in the vegetables, peel the eggs, cut them and add them. Season the quark with salt, caraway seeds, chives and parsley to your own taste and serve with the hot potatoes.