Potato and Cep Soup

• 200 g/7 oz porcini, finely diced
• 5 medium potatoes

Peel and roughly chop the potatoes, boil them in salted water with the garlic. Leave the potatoes to cook until they start to disintegrate. Pass the potatoes, cooking water and garlic through a food mill, return to the heat. Add half the butter, salt and freshly ground black pepper. Beat the mixture with a balloon whisk; if the mixture is too thick add some more water.

A few minutes bef