Pu-erh tea

„The piling, wetting, and mixing of the piled máochá ensures even fermentation. The bacterial and fungal cultures found in the fermenting piles were found to vary widely from factory to factory throughout Yunnan, consisting of multiple strains of Aspergillus spp., Penicillium spp., yeasts, and a wide range of other microflora. Control over the multiple variables in the ripening process, particularly humidity and the growth of Aspergillus spp., is key in producing ripened pu'er of high quality.“

„Bitterness
Broad leaf variety (Sinenesis Assamica) is high in natural constituents; polyphenols, caffeine,theine, etc. A particularly bitter flavour is a special characteristic of the Broad leaf variety, but it is important that it transforms quickly and does not linger. This is a mark of good quality Puer. NB there is a sub-variety in Yunnan - Var. ku cha which has different characteristics and does not transform in the same way.“