As anyone who’s spent time by a crackling campfire or a barbecue pit can attest, the scent of smoke is unmistakable—and surprisingly mysterious. Smoke clings to clothing but vanishes in the breeze. You see it, but you can’t hold it. It’s fantastic in whiskey and terrible in toast. So what exactly is smoke—and what does it do to our food and drinks? What’s the difference between cold and hot smoked salmon—and what's a red herring? Is Liquid Smoke made from real smoke? And how did barbecue— smoked meat, cooked low and slow—become a uniquely American tradition? Listen in to find out! (encore) Learn more about your ad choices. Visit podcastchoices.com/adchoices

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