“You cannot tell me this is a potato because it weighs a kilo and then some,” she said.
Other people had commented on the video that it had happened to them, too.
A Foodstuffs spokesperson said it seemed the potato-shaped, dirt-covered rock managed to sneak through the potato processing gate.
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“We appreciate the customer’s surprise – it would have been problematic to peel and there’s obviously not much nutritional value in boiled or roast rocks, so they’ve got every reason to call it out,” they said.
“The store is aware of the situation and will happily give the customer a replacement bag of potatoes, without having to return the original bag, or the rock.”
-RNZ