This rice and chestnut soup comes from the mountains of northern Italy and has long been a favourite of Sophie?s. This is a quick version, made with pre-cooked, vacuum-packed chestnuts that dispense with the tedium of peeling chestnuts, without sacrificing too much of the flavour. The starchiness of risotto rice makes it a marvellous addition to soups, giving a lovely creaminess that doesn?t interfere with the other ingredients.