Cook the onion with some oil into a pan at medium heat until it starts sizzling. In a bowl put the bread, speck cut in cubes, the crumbled sausage, onion, milk, eggs and nutmeg. Stir to blend and leave for about 1 hour. Add the flour and form the dumplings. Boil in salted water for about 15 minutes. If the dumplings are too soft add more flour, if too hard add some milk.