We know that spuds come in a multitude of varieties but did you know that La Bonnotte potatoes can sell for £523 ($660) per kilogram (2.2 lbs)? They grow in the mineral-rich soil of the small French island of Noirmoutier and are only in season for around a week in early May. You’ll need to time your visit to La Bonnotte restaurant, where potatoes are something of a house speciality, just right to get a taste.

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