Is dark chocolate good for you? Could daffodils help treat Alzheimer's disease? Jimmy, Kate and Matt uncover remarkable secrets about the nation's favourite springtime produce.

Jimmy Doherty, Matt Tebbutt and Kate Quilton take another look at some of their favourite food discoveries from Series 3 in this special episode.

Jimmy gives supermarket fish a sniff to discover how fresh the stock really is. Kate investigates how asparagus can be grown all year round in one of the driest places on earth - the Ica Valley, Peru.

Jimmy investigates whether manuka honey has any medicinal properties. Kate discovers why some varieties of caviar are so much cheaper than others. And Matt visits a Scottish distillery.

Kate visits France to find out if a glass of red wine a day keeps the doctor away. Matt lifts the lid on skimmed milk. How do dairy farmers get exactly the right amount of fat in every pint of milk?

Jimmy Doherty finds out why Iceland supplies most of our cod. Kate Quilton investigates whether the banana's days are numbered. And Matt Tebbutt discovers why popcorn doesn't fill you up.

Jimmy discovers that there's more to traditionally-matured cheese than meets the eye, thanks to a microorganism that helps give the likes of pecorino their distinctive hard rinds