Slowly cook the beef, pork and veal in butter with chopped onion, carrots and celery and a bunch of aromatic herbs, sprinkling them with white wine.
Cook the livers separately and add them to the meat when it is cooked.
Grind everything, let it cool and add a beaten egg to cream with a pinch of nutmeg.
Prepare the dough by mixing eggs and flour, roll out the dough very thin and cut it into squares. In the center of each square place a teaspoon of meat filling and close them giving them the characteristic shape of a tortellino, first folding them in half and then joining the opposite edges.
Let them air dry and then cook them in the boiling broth for a couple of minutes. Serve them in the cooking broth or, enjoy them dry, after draining them and seasoning with golden melted butter in which have browned sage leaves.