Wash the potatoes and cook in boiling water for about 30 minutes. Drain potatoes, steam and peel. While still hot, press them through a potato press and let them cool down. Add flour, starch and egg.
Season with about 1 level teaspoon of salt and nutmeg and knead to a smooth dough. Form into finger-thick rolls on a work surface sprinkled with flour. Cut 5-6 cm long pieces. Form these into potato noodles with pointed ends.
Bring plenty of salted water to the boil in a wide saucepan. Cook the potato noodles (possibly in portions) for about 3 minutes until they float on top. Take them out with a skimmer and let them cool down on a tea towel.
Peel onions and cut them into rings. Melt 4 tablespoons of butter in a large pan. Fry the potato noodles until golden brown. Melt 2 tablespoons of butter in another pan and fry the onions.
Add the onions to the potato noodles. Wash and chop the parsley and sprinkle over it.