First put on water, rinse the potatoes well and cook in the boiling salted water for about 20-25 minutes.
In the meantime, mix the quark and yogurt in a bowl. Cut the half onion and the cucumber very small, then mix in (everyone likes different amounts of cucumber, so maybe cut half a cucumber first and fold in. Maybe that`s enough). Then season with salt, pepper, parsley and lots of dill.
Serve the potatoes in their skins and with a big dollop of quark.
Tip: The dish also goes very well with fish in all possible variations.