
Aso takanazuke
Takana mustard greens from Aso in Kumamoto are salted and pressed into a fresh spring pickle, or aged into a sour furuzuke that is fried and mixed into takana rice.
Traditional method
醤油漬け · Soy sauce pickling · Soy-cured vegetables · Shōyuzuke
Foods steeped in soy sauce, a salty fermented seasoning liquid that transfers salt and fermentation products into them; shoyuzuke uses a transformed liquid medium rather than a fresh brine.

Shoyuzuke is a Japanese pickling in which food is steeped in soy sauce. The soy sauce is the preserving medium, and it carries salt and fermentation products into the food.
The record treats shoyuzuke as a method that takes its salt and its fermentation products from a liquid already transformed by fermentation. That makes it different from a fresh vegetable brine, which is salted and then fermented in place.
The sources give no salt levels, steeping times, temperatures or storage limits for shoyuzuke. The historical account does not validate a home method.
Foods are embedded in salty fermented soy sauce, which transfers salt and fermentation products into them. Shoyuzuke therefore uses an already transformed preserving medium rather than the process of a fresh vegetable brine.
Scaling: source batch only
The sources give no salt level, steeping time or storage limit for shoyuzuke.
Hazard sourceUse a tested recipe that sets the salt level, steeping time and storage conditions.
Control sourceThe sources record historical practice only. They are not a tested home method.
Historical Japanese pickling; the source does not give a single place or date of origin for shoyuzuke.
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Ministry of Agriculture, Forestry and Fisheries of JapanMethod · History
https://www.maff.go.jp/e/policies/market/dento_syoku/bunrui/tukemono.htmlFoods embedded in salty fermented seasoning liquid take on salt and fermentation products
Shoyuzuke uses an already transformed preserving medium rather than a fresh brine
Cited in: What it is; How the soy sauce acts; Limits of the record