Wash and peel the potatoes and cook in salted boiling water for about 20-25 minutes.
Then wash the parsley about 5 minutes before the end of the cooking time, pluck the leaves from the stems and chop. Peel the onion and finely dice it together with the bacon, fry both in the melted butter until crispy. Then add the parsley. Keep warm.
Drain the potatoes and let them evaporate on the hot plate for 2 minutes. Bring the milk to the boil with grated nutmeg, salt and pepper and remove from the stove. Put the potatoes through a press, stir in the milk and fold in the bacon mixture. Serve hot.