Puer tea has been grown for centuries in the "Six Great Tea Mountains" of Yunnan Province, and in imperial China it was a prized commodity, traded to Tibet by horse or mule caravan via the so-called Tea Horse Road and presented as tribute to the emperor in Beijing. In the 1990s, as the tea's noble lineage and unique process of aging and fermentation were rediscovered, it achieved cult status both in China and internationally. The tea became a favorite among urban connoisseurs who analyzed it in language comparable to that used in wine appreciation and paid skyrocketing prices. In 2007,...