Pu-erh is a type of fermented tea that comes from the Yunnan province of China. After the tea has been harvested, dried, and processed, it undergoes a fermentation that causes the tea to develop its tell-tale dark color and earthy flavor profile. The tea will continue to age over time and more intense flavors can develop. This tea has a moderate caffeine level and brews a deep, reddish brown liquor. While flavors from pu-erh teas can vary, it is prized for its smooth, herbaceous profile.