In Istanbul, the MasterChef judge explores the history of a city that has been the centre of three empires. He tours the street food stands on the Asian side of the Bosphorus, learns the centuries-old techniques of the baklava makers, joins a kebab master at his grill, and eats dishes that would have graced the tables in the Ottoman palaces of old. Gregg finishes his weekend off with a special trip to an island just off the coast for a feast of traditional Turkish mezze.