Chinese Fermented Black Bean (Dou Chi) — Production and Applications
China — national production; Yangjiang (Guangdong) and Hunan are primary regions
Dou chi (豆豉) — fermented black soybean — is one of the oldest fermented condiments in China (documented Han Dynasty). Black soybeans are cooked, inoculated with Aspergillus or Rhizopus moulds, then salted and either dried (dry dou chi) or packed wet (wet dou chi). The fermentation produces rich glutamate complex that defines dishes from Hunan steamed fish head to Cantonese black bean spare ribs.