Pu-Erh tea (also known as aged or vintage tea) is another of China’s great treasures and has only recently been discovered in western countries. It is unlike any other tea in the world but Westerners can appreciate its similarities to fine wine, with which it shares many attributes. Like the great wine regions of the world, Pu-Erh Tea production is highly regulated to ensure the highest quality and authenticity. Only aged tea that comes from Yunnan province can be called Pu-Erh tea. Sheng or raw Pu-Erh are green teas. Their aging protential is tremendous. Shu or cooked Pu-erh are black teas. Some Yunnan white teas are now also being pressed into cakes or tuo cha.