Cook the potatoes for about 20 minutes in boiling water. Then rinse with cold water, peel and leave to rest. In the meantime peel onion and dice finely. Wash the chives and cut into small rolls. Wash parsley and chop it, except for a few leaves for garnishing.
Wash and clean the tomatoes. Cut a tomato into quarters and remove the seeds. Cut the flesh into small cubes. Cut the rest of the tomato into slices. Mix quark, onion and herbs. Season with salt and pepper. Cut potatoes into slices. Heat oil in a pan. Fry the potatoes for about 8 minutes while turning them over. Season with salt and pepper.
Cut potatoes into slices. Heat oil in a pan. Fry the potatoes for about 8 minutes while turning them over. Season with salt and pepper. Arrange tomato slices, fried potatoes and dip. Sprinkle with tomato cubes and parsley leaves. Serve with Bündnerfleisch