1.Heat the butter in a pan, add the onions and sauté for a while, then cover and let it cook for sometime.
2.When the onions, become soft remove the lid and stir.
3.Now add the stock, pepper, nutmeg, salt and bring to a boil.
4.Cover again and simmer over a low heat.
5.Place the bread slices on a baking tray and bake for a few minutes or till the bread turns light brown in colour.
6.Serve the soup in a bowl, garnished with a slice of browned bread and grated cheese.