In Iran, food plays a central role in family life, through festivals, feasts and elaborate hospitality. The cuisine traces its heritage back to the Persian Empire, combining local ingredients like saffron, grapes and pomegranates with exotics brought in on the Silk Road, such as rice, aubergines and lemons, to create unique and enduring flavours. Sheila Dillon explores Iran's food culture. Producer Rebecca Moore Repeated tomorrow at 4pm