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Iwate rice miso is a salty grain miso of the Tōhoku Pacific coast. Steamed, crushed soybeans are mixed with whole-grain rice koji, salt and a little yeast-seeded water, started cool, turned once and ripened warm for about half a year. The koji ratio was 7 wari in the past and is 10 wari, equal weights of rice and soybeans, in most Iwate miso today.
Fully documentedSoy and legumes6.1 months
Recipe
Amounts from a sourceThe 10-wari koji batch of a 2024 trial at the Iwate Industrial Research Institute; a 7-wari batch used 9.8 kg beans, 4.1 kg koji, 2.2 kg salt and 1.2 kg seed water.
A salt-tolerant yeast culture diluted six times with tap water[IWATE-2024]
Starter
rice koji (koji mould; the trial report does not name the species); the 2024 trial also added seed water with the salt-tolerant yeast Zygosaccharomyces rouxii RM-3
Total time across the recorded steps: 6.1 months
Start
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What changes:Washed rice soaks overnight and steams for an hour
Step 1 of 6
Soak and steam the rice
Time
1 h
Reported
Temperature
Not documented
Salt
None given
Acidity
Not documented
Which microbes the steps name, step by step
Moulds
Zygosaccharomyces rouxii
Yeasts
Output: steamed rice, cooled.
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
Iwate rice miso is a salty grain miso of the Tōhoku Pacific coast. Steamed, crushed soybeans are mixed with whole-grain rice koji, salt and a little yeast-seeded water, started cool, turned once and ripened warm for about half a year. The koji ratio was 7 wari in the past and is 10 wari, equal weights of rice and soybeans, in most Iwate miso today. Made in 6 steps over 6.1 months. The longest step, warm ripening, takes 5 months (Hatakeyama M 2024) and runs at 30 °C (Hatakeyama M 2024). Salt is 11.4–11.9 % (Hatakeyama M 2024). Koji mould and Zygosaccharomyces rouxii RM-3 do most of the fermenting.
Iwate miso keeps whole koji grains and now uses a high 10-wari koji ratio for a salty rice miso. The Aichi type table gives salty red rice miso, made across Tōhoku, a koji ratio of 5–10, 11–13 % salt and 3–12 months of ripening [aichi-itc].
Miso-dama home miso (northern Iwate)Beans boiled in late March, minced and shaped into balls of about 3 gō, hung from the ceiling on straw to dry; when white mould shows in the cracks in late April, the balls are washed, soaked overnight, crushed and packed with salt and koji, or with no koji [Murai1975].
Old Morioka home misoSoybean 1 shō, koji 5–7 gō and salt 3 gō, about soybean 10 to koji 37–53 % and salt 11–12 %. Home miso was kept 3–5 years against famine and was thought unfit to eat before 3 years [Murai1975].
Safety
The Aichi sheet says salty (karakuchi) miso, at about 12 % salt, has enough salt to stop unwanted microbes, which lets it ripen for a long time [aichi-itc]. The finished Iwate trial misos, analysed after 6 months of ripening, held about 11–12 % salt [IWATE-2024].
The old Nanbu domain grew soybeans as a cash crop and for horse feed. A 1950s survey of Iwate home miso found salt from 11 to 22 % and water from 47 to 62 %, showing very different methods [Murai1975]. The 2024 trial notes that 7-wari koji miso was once common on the Tōhoku Pacific side and that 10-wari is now the Iwate mainstream [IWATE-2024].