Mix flour, eggs, 1 teaspoon of salt, nutmeg and mineral water to a thick dough. Let dough rest for about 1 hour. Boil up plenty of salted water. Gradually put a part of the spaetzle dough on the moistened "spaetzle board" and scrape fine strips into the boiling salt water with a long knife. Bring to the boil until the spaetzle rise. Remove the spaetzle with a skimmer and rinse briefly in a sieve under cold water. Drain and keep warm.
Process the remaining dough in the same way. Peel onions and cut into rings. Heat clarified butter in a pan. Fry the onion rings in it until golden brown and take them out. Put butter into the pan and melt it, stir in breadcrumbs. Arrange spaetzle in a bowl. Add the onion rings and pour the crumble butter over them
Waiting time approx. 1 hour