Pu-erh teas form a very diverse and distinctive group; they are made from a large-leaf variety of tea tree that grows in the tropical mountainous area of Yunnan. They are easily recognised for their specific flavour and appearance. However, many people are surprised by the wide range of flavours, aromas and colours they offer. What is it then that characterises the pu-erh? How does it differ from other teas? It is about several specific properties that pu-erh teas should have.