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golden, whole-grain soybean paste in liquor; dipping sauce for Teochew fish rice (鱼饭), and used in steamed fish, stir-fried snails and braised bitter melon [Sina2018]. Made in 5 steps over 3 months – 5 months. The longest step, brine and sun-ferment in open jars (推水醭), takes 3–5 months (记忆中的潮汕味道!普宁豆酱凭什么成为潮汕酱料的王牌? (reprinted from 悦食…). Aspergillus oryzae (starter); brine-stage microbes not studied in any source found does most of the fermenting.
Starter: koji/qu/mold-starter: Aspergillus oryzae ('食用菌种,主要是米曲霉') mixed with flour [Sina2018]
Total time across the recorded steps: 3 months – 5 months
Start
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What changes:Soybeans are sun-dried, cracked and split into halves
Step 1 of 5
Sun-dry beans, crack and dehull into halves (曝豆, 碾豆)
Time
one dry sunny day (humid weather stops clean dehulling)
Unconfirmed
Temperature
sun
Unconfirmed
Salt
0
Unconfirmed
Acidity
Not documented
Which microbes the steps name, step by step
Aspergillus oryzae
Output: dehulled split beans [Sina2018].
Flavour
Not documented
Texture
split cotyledons (豆瓣)
Colour
Not documented
Microbes at work in this step
none
Method
Measured measured in a studySet fixed by a specification or tested recipeReported one source reports itTypical a general value, not sourced for this fermentUnconfirmed not yet checked against a source
Variants
Teochew home bean pastesteamed beans covered with a quilt 3–5 days instead of a koji room, then brined in a pottery urn in the sun 1–2 months [Sina2018]
Thai 'tao jiao Phow Leng' (เต้าเจี้ยวโผวเล้ง)Thai name for the Puning style (Phow Leng = Teochew reading of Puning); Thai soy pastes are sun-fermented 3–6 months in jars [trueplookpanya, search summary]
Safety
Commercial labels list soybean, salt, wheat flour, water plus sodium benzoate, acesulfame and MSG [PMC10855112]. Heat treatment after sun fermentation gives the long shelf life.
Puning county founded 1563. Bean-paste workshops from the late Ming–early Qing; large-scale production in the Daoguang era; Fang Shuzhe opened the Yuanxing (源兴号) works in Hongyang in 1840; more than ten firms in the Republican era; 12 firms merged into the Hongyang soy-sauce cooperative in the 1950s [WP-zh, PunningGov2022, Sina2018]. Listed as Guangdong provincial intangible cultural heritage in January 2009 [WP-zh].
[PMC10855112] A Systematic Comparative Study on the Physicochemical Properties, Volatile Compounds, and Biological Activity of Typical Fermented Soy Foods. Foods 2024;13(3):415paper