Why is there jelly in our pork pies and how does it get there? What in nature provides the natural bright blue dye in our sweets? And why is soft shell crab such a delicacy?

Jimmy Doherty sets out to find out how to make a kipper, and why this nutritious fish is no longer a breakfast favourite in Britain. In the Netherlands, Jimmy wonders if we should copy the Dutch, who eat their herring raw. In Germany, Kate Quilton investigates gherkins, and discovers a space-age machine that can pickle food in seconds. And if rice cakes are made from brown rice, how come they're white? Matt Tebbutt and Helen Lawal investigate.