Yunnan Pu Er Tea is unque in that it gets better with age, much like wine. It initially starts out as a green tea but is not fully fired. Instead, the moist leaves are loosely stacked on top of each other to allow to dry and age. The result is a color change from green to a deep burgundy. Premium Special Grade Pu-er has a smoother and sweeter taste than lower grade Pu-er.