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Hon-mirin is a sweet rice liquor brewed from steamed glutinous rice, rice koji and shochu or distilled alcohol. The spirit is in the mash from the start, so yeasts cannot ferment; the koji enzymes alone break the rice starch into sugar over 30–60 days at 20–30 °C. The pressed liquid holds about 45 % sugar and 14 % alcohol, all of it from the spirit.
Fully documentedAlcoholic drinks30 days – 2 months
Recipe
Amounts from a sourceOne Edo-period batch recorded in Nihon sankai meisan zue (1799), as summarised by the National Tax Agency; 1 koku = 10 to. Today's mixes use much less shochu and koji than Edo-period ones, and the sources give no current recipe.
Edo-period recipe; koji was later made from non-glutinous rice[nta-mirin]
Shochu10 koku
Edo-period recipe; today shochu or distilled alcohol[nta-mirin]
Starter
rice koji (enzymes only; no alcoholic fermentation)
Total time across the recorded steps: 30 days – 2 months
Start
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What changes:Glutinous rice is steamed, and koji mould is grown on other steamed rice
Step 1 of 5
Steam glutinous rice and make rice koji
Time
Not documented
Temperature
Not documented
Salt
None given
Acidity
Not documented
Which microbes the steps name, step by step
Yeasts
Moulds
Aspergillus oryzae
Early koji was also made from glutinous rice; non-glutinous rice was used for the koji later. Output: steamed glutinous rice and rice koji.
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
Hon-mirin is a sweet rice liquor brewed from steamed glutinous rice, rice koji and shochu or distilled alcohol. The spirit is in the mash from the start, so yeasts cannot ferment; the koji enzymes alone break the rice starch into sugar over 30–60 days at 20–30 °C. The pressed liquid holds about 45 % sugar and 14 % alcohol, all of it from the spirit. Made in 5 steps over 30 days – 2 months. The longest step, saccharify and mature the mash, takes 30 days – 2 months (National Tax Agency of Japan 2021) and runs at 20–30 °C (National Tax Agency of Japan 2021). Aspergillus oryzae (yellow koji mould), grown on the rice koji; mirin needs koji with high saccharifying and protease activity does most of the fermenting.
Unlike sake, hon-mirin has no alcoholic fermentation. Spirit is added at the start, so only the koji enzymes work and almost all the sugar stays. Mirin-style seasonings (under 1 % alcohol) and salted mirin-type fermented seasonings are not liquor under the tax law.
Mirin first appears in documents of 1586-1592, in the Sotan nikki; the spelling 味醂 first appears in 1614. An Edo recipe of 1697 (Honchō shokkan) gives glutinous rice, koji and shochu stirred every 7 days. The National Tax Agency notes that early mirin had far less sugar (about 1 % to 30 %) than modern hon-mirin [nta-mirin].