Cut the potatoes in thin strips, as if you were going to make very small chips. Heat the olive oil in the saucepan, brown the onion, then add the potatoes and season them with salt, pepper, nutmeg, and thyme. Pour over the boiling broth. In 15 minutes the soup will be cooked.

To go with it, prepare the following crostini: saturate the slices of bread with melted butter; spread them thickly with grated Parmesan and cook them in a moderate oven for 10 minutes.

This soup, which is good and so easy to cook, can be made with water instead of stock, provided a little bacon or ham (about 2 oz.) is cooked with the onion to give flavour.