Kippers, Gherkins, Rice Cakes

Jimmy Doherty sets out to learn how kippers are produced, and finds out why this nutritious smoked fish is no longer a breakfast favourite, while Kate Quilton is in Germany to investigate gherkins, discovering a space-age machine that can pickle food in seconds. Matt Tebbutt and Helen Lawal try to discover why rice cakes are white when they are made of brown rice.