You know the drill, you decide to got for a potted plant of herbs in the supermarket rather than a bag because you'll be able to keep that thing alive, right? Inevitably it dies however, but don't worry, you are not alone, and tonight on Food Unwrapped, Matt Tebbutt visits Britain's largest producer of fresh herbs to learn about a new hi-tech method of extending shelf-life. Also on the show, Jimmy Doherty heads to Thailand to find out about the surprising ingredient that makes a prawn cracker unique while Kate Quilton investigates what actually goes into sodium-replacement salts and examines whether salt really deserves its unhealthy reputation.