Peel the potatoes, wash them thoroughly and bring them to the boil in a pot of salted water. Cover and cook over medium heat for about 25 minutes. Wash liver and pat dry with kitchen paper. Mix flour and pepper. Turn the liver in it. Heat clarified butter in a large frying pan and fry the liver on each side over medium heat for 2-3 minutes.
In the meantime wash parsley and dab dry. Put some leaves aside if you like. Chop the rest finely. Heat milk and butter in a small pot. Drain the potatoes, mash them with a potato masher and add the milk and butter mixture. Season to taste with salt and nutmeg. Remove liver from the pan and keep warm. Peel onions and cut into rings. Wash the apples and cut out the cores with an apple cutter. Cut apples into rings. Put the onion rings in the frying fat and fry them until golden brown while turning. Add the apple slices and fry briefly.
Remove liver from the pan and keep warm. Peel onions and cut into rings. Wash the apples and cut out the cores with an apple cutter. Cut apples into rings. Put the onion rings in the frying fat and fry them until golden brown while turning. Add the apple slices and fry briefly. Add liver again and season everything with salt and pepper. Sprinkle the mashed potatoes and liver with parsley and serve on plates garnished with parsley as you like