Nigel Slater's Middle Eastern food adventure concludes with a visit to a country shrouded in mystery and often in the headlines: Iran.Here Nigel sets out to discover the secrets of Persian food, one of the oldest and most influential cuisines in the world. He begins his journey in the bustling capital Tehran, where he is invited into the homes of people who cook dishes that have been handed through the generations. He is taken to lunch at his taxi driver's house to sample Dizi, an Iranian favourite for hundreds of years and possibly the nation's most popular dish.