Jimmy Doherty finds out how Sri Lanka is coping with a looming coconut shortage, while Kate Quilton discovers whether compostables could be the answer to worldwide plastic pollution problem, annd Matt Tebbutt is in Paris to learn why the macaron has such a hefty price tag.

Kate uncovers something surprising about small hens' eggs. Plus: why can't you eat supermarket burgers pink? And where do the bubbles in beer come from?