Vegetables that grow on the ground are more likely to be contaminated with bacteria, since runoff from animal waste is likely the source of contamination.

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"I like to let the ingredients speak for themselves, " he says, and they do: Aoraki salmon from glacial waters, Cardrona Merino lamb, vegetables grown in his garden ("those beets were in the ground a few hours ago, " he told me), and eggs from his 21 chickens.

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"Lately we started growing vegetables organically, " she says, as her mate spreads dirt on the ground.

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That is because unlike ground beef, which is cooked at a temperatures which destroy bugs, fruit and leafy vegetables tend to be eaten raw.

ECONOMIST: Tech.view