Food Unwrapped is on a global quest to uncover the truth about the food we eat. Jimmy Doherty is in Sri Lanka, to find out how they are coping with a looming coconut shortage. Kate Quilton discovers whether compostables could be the answer to our worldwide plastics problem and Matt Tebbutt hits the cafes and kitchens of Paris to find out why the deliciously delicate macaron has such as hefty price tag.