Pu erh Tea is an art form all on its own and is a type of fermented tea. It first undergoes a process similar to green tea, but before the leaf is dried, it's aged either as loose-leaf tea or pressed into dense cakes. Depending on the type of pu erh being made (either shou or sheng), the aging process lasts anywhere from a few months to several decades. Very old, well-stored pu erhs are considered "living teas", just like wine. They are prized for their earthy, woodsy or musty aroma and rich, smooth taste.