Return of the programme looking at the secrets behind mass-produced food. Matt Tebbutt finds out how much meat is in a sausage and how the great British banger got its name. Kate Quilton investigates orange wine and how it gets its colour, and Amanda Byram discovers the high-tech solution to cutting a perfect slice of millionaire's shortbread.

Matt Tebbutt unbottles the mystery of wine sulphites and hangovers, Amanda Byram explores how peas could solve the plastic pollution problem, and Andi Oliver wonders how shop-bought grated cheese doesn't stick together.