Pu-erh tea (普洱茶, named for Pu'er city in Yunnan province) is the most complex and most debated category of Chinese tea — a tea that undergoes two fermentation processes: a microbial fermentation of the processed tea leaves in warm, moist conditions (for shu/cooked pu-erh) and an extended aging under controlled conditions (for sheng/raw pu-erh, which develops complex fermented notes over years or decades). Unlike green tea or oolong which degrade in flavour over time, well-stored pu-erh improves with age — the finest aged pu-erh cakes (bing cha, 饼茶) can be centuries old and command extraordinary prices. In Cantonese yum cha culture, pu-erh is the most commonly drunk tea, valued for its ability to cut through the rich, fatty dim sum preparations and aid digestion.
Shu (cooked, 熟) pu-erh vs Sheng (raw, 生) pu-erh: Shu pu-erh has undergone accelerated wet-pile fermentation (wo dui, 渥堆) — the tea leaves are piled, moistened, and turned over weeks to months in a hot, humid environment. The result: a dark, earthy, smooth tea with notes of earth, mushroom, and compost that can be drunk immediately. Sheng pu-erh is compressed into cakes and aged without the wet-pile process — young sheng is astringent and somewhat harsh; aged sheng (10+ years) becomes smooth, complex, and develops fermented notes without the earthiness of shu. Brewing: Pu-erh is traditionally brewed using the gong fu method (工夫茶, skill tea) — multiple short infusions in a small clay teapot, using a high leaf-to-water ratio and very hot water (95-100C). The clay of the yixing teapot (宜兴紫砂壶) absorbs the oils of the tea over time and contributes to the flavour. Cooking with pu-erh: Pu-erh tea is used in Yunnan to braise meats (the tannins tenderize and the earthy notes complement lamb and pork) and as a smoke replacement in tea-smoked duck preparations.
Fuchsia Dunlop, Every Grain of Rice (2012); Fuchsia Dunlop, Invitation to a Banquet (2023)