Before you put your onions in a pot where you cook the soup, turn on you broiler! Brown the onions, and add to the pot the stock, oregano, & nutmeg. Bring this to a boil, add the fish. Cook the soup till the fish is done but not falling apart.
Divide the soup into Bowles large enough a slice. Put the bread on top of the soup, cover the bread with the Parmesan and place the bowls in the broiler. Brown the cheese, it only takes a minute.