Store Cupboard Staples

Compilation of reports on store cupboard staples, including Kate Quilton taking a look at the secrets behind peanut butter's long shelf life, solving the mysteries of Marmite's famously divisive flavour, and discovering if it is safe to feed cats dog food and vice versa. Jimmy Doherty travels to Sri Lanka to discover why lentils are sold split rather than whole, and Matt Tebbutt witnesses anchovy fishing off the coast of Italy.