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Aijiro miso (lightly sweet pale rice miso of Shizuoka)相白味噌
Aijiro is the lightly sweet, pale rice miso of Shizuoka, where it is simply called white miso. Mostly dehulled soybeans are boiled pale, packed hot with plenty of white rice koji into large vats, and left about ten days to ripen on their own heat, with no outside warming and no turning.
Fully documentedSoy and legumes5.1 days – 20 days
Recipe
Amounts from a sourceOne maker's example from Inamori 1965, planned to give 1,900 kg of miso.
Soybeans660 kg
Weight before dehulling; about 80 % of the hulls are removed[INAMORI-1965]
Rice (for koji)450 kg
Domestic rice, polished about 10 % (7.5 % in the example)[INAMORI-1965]
1.5 mg per 100 g of miso, for a bright pale-yellow colour[INAMORI-1965]
Starter
white, slow- and low-sporing seed koji (Aspergillus oryzae) chosen for strong amylase
Total time across the recorded steps: 5.1 days – 20 days
Start
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What changes:Lightly polished rice soaks briefly, then steams hard and fast
Step 1 of 6
Polish, soak and steam the rice
Time
1–1.5 h
Reported
Temperature
Not documented
Salt
None given
Acidity
Not documented
Which microbes the steps name, step by step
Moulds
A short soak and long drain keep even soft rice firm enough for good koji. Output: firm steamed rice.
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
Aijiro is the lightly sweet, pale rice miso of Shizuoka, where it is simply called white miso. Mostly dehulled soybeans are boiled pale, packed hot with plenty of white rice koji into large vats, and left about ten days to ripen on their own heat, with no outside warming and no turning. Made in 6 steps over 5.1 days – 20 days. The longest step, ripen on its own heat, takes 5–20 days (Itō M) and runs at 56 °C (Inamori M. 1965). Salt is 7–12 % (Itō M). Aspergillus oryzae does most of the fermenting.
Aijiro sits between Kyoto white miso and salty pale miso. It has less koji and more salt than Kyoto white miso, but it is packed hot and ripens in about ten days on its own heat, so it stays pale and sweet. Inamori insists the sweetness must come only from the koji, never from added sweeteners.
Japanese Wikipedia, drawing on Inamori's 1974 survey of Shizuoka miso, says a Shōsōin document of about 738 records Suruga province producing misho (an early miso) and soybeans, and that the Edo-period Sunkoku zasshi describes a sweet white miso made in Abe district and elsewhere. It adds that tororo-jiru made with aijiro became a specialty of the Mariko post town [JA-WP-AIJIRO].