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Yukiwari natto (and its older form, Goto natto)雪割納豆
Yukiwari natto is cracked natto fermented a second time with rice koji and salt. Roasted, split and dehulled soybeans are steamed and fermented with natto bacteria, then mixed with salt-cut koji, weighted in a barrel and ripened into a salty, miso-like relish. It comes from Goto natto, a farmhouse food made at New Year and ripened until spring.
Fully documentedSoy and legumes15 days – 40 days
Recipe
No fixed amounts recordedNo published recipe gives amounts. The MAFF entry lists the ingredients only.
Listed among the main ingredients of the commercial product[maff-yukiwari]
Starter
two stages; natto bacteria first, then rice koji enzymes with salt
Total time across the recorded steps: 15 days – 40 days
Start
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What changes:Roasted soybeans are split, dehulled, soaked and steamed
Step 1 of 5
Roast, split, dehull, soak and steam the soybeans
Time
Not documented
Temperature
Not documented
Salt
None given
Acidity
Not documented
Which microbes the steps name, step by step
Bacillus subtilis
Moulds
Output: steamed split soybeans.
Flavour
Not documented
Texture
Not documented
Colour
Not documented
Microbes at work in this step
Not documented for this step.
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
At a glance
Yukiwari natto is cracked natto fermented a second time with rice koji and salt. Roasted, split and dehulled soybeans are steamed and fermented with natto bacteria, then mixed with salt-cut koji, weighted in a barrel and ripened into a salty, miso-like relish. It comes from Goto natto, a farmhouse food made at New Year and ripened until spring. Made in 5 steps over 15 days – 40 days. The longest step, weight in a barrel and ferment a second time, takes 15–40 days (Shurtleff W 1975) and runs at 25–33 °C (Shurtleff W 1975). Bacillus subtilis var. natto (natto bacteria), first fermentation and Koji mould of the rice koji, through its enzymes, second fermentation do most of the fermenting.
Ordinary natto stops after the Bacillus fermentation. Yukiwari natto adds rice koji and salt and ferments a second time, which makes it salty and miso-like and lets it keep [maff-yukiwari].
Goto nattoThe farmhouse form; split-bean natto made at New Year was mixed with rice koji and salt and ripened until spring, to eat during the April–May farm work. One account gives about a month of ripening [maff-yukiwari, sic-natto]. A food writer describes it the same way, with split beans put in the kotatsu at New Year to make split-bean natto, then mixed with rice koji and salt, bottled and ripened until spring [ishiguro2022].
Safety
The high salt content (9.3 % in one analysis) keeps it from spoiling quickly; it is stored cold after ripening [maff-yukiwari, sic-natto].
Goto natto was made in Okitama farmhouses from the Edo period, as a stand-by against famine and as food for the busy spring farm season [maff-yukiwari]; SoyInfo dates it to about 1735 [sic-natto]. It was sold as yukiwari ("snow-breaking") natto from 1956. The maker closed in 2014 (the page also gives Heisei 28, which is 2016) and a new local company took over the same year, with the old maker's craftsmen [maff-yukiwari].