Pu-erh tea

„Pu'er traditionally begins as a raw product known as "rough" Mao Cha (毛茶) and can be sold in this form or pressed into a number of shapes and sold as "raw" Sheng Cha (生茶). Both of these forms then undergo the complex process of gradual fermentation and maturation with time.“

„After ini­tial taste and aroma, the first thing tea drinkers are likely to focus on is known in Chi­nese as 回甘 [huí gān]. In Eng­lish, a near lit­eral trans­la­tion is “Return­ing Sweet­ness,” but we can think of this loosely as after­taste. You can expe­ri­ence this clearly in most good teas, and prob­a­bly already have. In the best teas, though, the taste can go on for hours.“