Tianmian sauce
Chinese sauce in the form of a thick brown paste

Tianmian sauce (Chinese: 甜麵醬/甜醬; pinyin: tiánmiànjiàng; tiánjiàng), also known as sweet bean sauce, sweet flour sauce or sweet wheat paste, is a thick, smooth, dark brown or black paste with either a mild, savory or sweet flavor. It is commonly used in Northern Chinese cuisine, Northeastern Chinese cuisine, and Korean-Chinese cuisine. Peking duck and jajangmyeon are two popular dishes that feature the sauce.
Etymology
The Chinese word tiánmiànjiàng (甜麵醬) consists of characters meaning "sweet" (甜), "flour" (麵), and "sauce" (醬). It is also called tiánjiàng (甜醬), which means "sweet sauce". The origin of the Korean word chunjang (춘장) is unknown. One theory is that it derived from the word cheomjang (첨장), which is the Korean reading of the Chinese characters 甛醬.
Preparation
Although terms such as "sweet bean sauce" and "sweet bean paste" are used to describe the sauce, it is primarily made from fermented wheat flour. A mixture of approximately 95% of wheat flour to 5% of soybean is used. The fermentation starter is made from dried or stale mantou (a steamed bread), wrapped in a variety of true melon known as miangua and then bound and hung in a cool, dark place until completely dried.
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