Jimmy Doherty heads off to Israel on the trail of the fresh date, with his search taking him to a vast water purification plant where the raw sewage of Tel Aviv is used to turn barren desert into fertile farmland. Kate Quilton is in Belfast to meet a sausage-maker whose sales suffered in the wake of the recent World Health Organisation report linking processed meat to cancer, while Matt Tebbutt is in Kent, where experts have perfected the science of growing apples.