Jimmy Doherty’s mission to unravel the scientific secrets behind mass food production continues with an investigation into the contents of homemade sandwiches.

Why does supermarket bread stay soft longer than home-baked bread? Jimmy attempts to recreate some “supermarket bread”, building his own factory mixer from a metal dustbin. He also wonders what it is about processed cheese slices that people love so much – after all, they’re only 60 per cent cheese. Could it simply be that they’re sliced-bread shaped? Back in the barn, Jimmy sets up his own processed-cheese production line to find out what the other ingredients are.

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