Winged Bean 四角豆

Winged bean ( Psophocarpus tetragonolobus ), known as kacang botal in Malay, 四角豆 in Mandarin.

It is called “1-species supermarket” because practically all of the plant is edible. The beans are eaten as a vegetable. Dried seeds are used to make flour and a drink similar to coffee. The young pods are eaten as greens, similar to other beans. The flowers are used to colour rice and pastries. The young leaves can be eaten as leaf vegetables. The root are use as a root vegetable, similar to the potato.

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Source : Wikipedia