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.“

„In some ways, by doing so you’re basically cupping the tea without cupping it – you’re testing whether or not the tea is good for your style of brewing. Even then, however, a good tea drinker should be adjusting to the tea and trying to brew it as best s/he can, which means that the first try can come out horribly wrong.“