Wash the potatoes thoroughly and scrape off the skin. Heat the oil in a large pan. Fry the potatoes for 20 minutes at medium heat, turning them over. Cut the cured pork loin into cubes and add to the potatoes ten minutes before the end of the frying time.
Clean and wash the spring onions, cut them into rings and cook for the last five minutes. Season with salt, pepper and rosemary. Stir curd and milk until smooth. Season to taste with salt and pepper. Wash herbs, chop parsley finely, cut chives into small rolls.
Stir the herbs into the quark. Serve the potato pan with the herb quark. Garnish with rosemary.