Good Food: Earlier this year, when a salmonella outbreak affected more than 100 people, eyebrows collectively raised at the cause. Not meat, not fish, not cheese – the salmonella was linked to pre-packaged lettuce, of all things. And while, at the time, Produce Marketing Association technology manager Richard Bennett said that trying to eradicate salmonella would be “like trying to eradicate oxygen” – futile, because it’s everywhere – the take-home message was that we just aren’t washing our fruit and veg properly. In the case of lettuce, in particular, with its deep crevices, bacteria can harbour within the spaces and grow freely, totally invisible to the naked eye.

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