Wash parsley, shake dry, pluck leaves from the stalks and chop finely. Peel and wash the potatoes and cut them roughly into pieces. Cover the potatoes and cook them for about 20 minutes in little boiling salted water.
Crumble tacos, whisk eggs and horseradish in a deep plate. Season schnitzel with salt and pepper. Turn one after the other in 4 tablespoons of flour, egg and tacos.
Peel and finely dice 1 onion. Heat 1 tbsp. butter in a pot and fry diced onions until translucent. Add 50 ml milk, sour cream and peas, bring to the boil and simmer for about 5 minutes. Cut remaining onion into rings and dust with 1 tsp flour.
Heat 200 ml of milk. Drain the potatoes. Add 50 g butter, warm milk and some nutmeg and mash. Keep mashed potatoes warm. Heat clarified butter in 2 large frying pans and fry escalopes in them for about 5 minutes while turning.
Remove the cutlets, keep warm and fry the onion rings in a hot pan while turning. Season with salt and chilli powder. Arrange mashed potatoes, peas and schnitzel. Sprinkle with onion rings and parsley.