About Oolong Tea Oolong tea is generally referred to as "semi-fermented" tea and is principally processed in China and Taiwan (often called Formosa, its old Dutch name). For the manufacture of oolongs, the leaves are wilted in direct sunlight, then shaken in bamboo baskets to lightly bruise the edges. Next, the leaves are spread out to dry until the surface of the leaf turns slightly yellow. Oolongs are always whole leaf teas, never broken by rolling. The least fermented of oolong teas, almost green in appearance, is called Pouchong.

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