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Oca (Oxalis tuberosa)
A common crop in the High Andes, second only to the potato in popularity. It was introduced to Britain in 1829, and grows well here, as it does in New Zealand where it is quite popular.
They are "short-day plants" producing small tubers which can be treated in the same way as potatoes.
If growing them at home, leave them in the sun for a few days once dug, as this sweetens the flavour. See 'Short-Day-Plants'