They’re in your chocolate, your gelato, even your coffee - pistachios seem to be everywhere at the moment - bolstered by the craze for Dubai Chocolate. In this episode Leyla Kazim asks what happens when the world seems to fall in love with one ingredient.

She explores how the United States came to overtake traditional producers in the Middle East to become the world's largest pistachio grower, and hears about the nut's long history in countries such as Iran from Iranian-American food writer Anna Ansari. Meanwhile, Honey & Co.'s Sarit Packer and Itamar Srulovich demonstrate how versatile pistachios can be, creating both sweet and savoury dishes.

Nick Moss, nuts market reporter at Expana, explains what's happening to pistachio prices and why forecasts for this year's harvest are lower than usual.

Leyla also visits Green Lanes in Haringey, home to many Turkish and Middle Eastern businesses, to discover how pistachios have long been central to traditional desserts - and hears how rising prices are changing that. Finally, she meets Charlie Tebbutt, whose south London company Food & Forest imports nuts, including pistachios, from farms that are either avoiding irrigation or using agroforestry methods, as an alternative to the vast monocrops that supply most of the world's pistachios.

Produced by Natalie Donovan for BBC Audio in Bristol