Kate Quilton makes for Lincolnshire, to see whether shallots are actually just small onions. Helen Lawal is in Spain to find out why you get sheep's cheese in the supermarket, but never sheep's milk. Kate visits a potato farm looking for the reason why baking potatoes cost more, while Matt Tebbutt heads to McCain to learn the best way of baking 6000 of them in one batch.

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Documentary