How Sake Is Made

## From Rice to Sake

Sake production is a meticulous journey through a dozen or more carefully controlled steps. Each decision — from the degree of rice polishing to the fermentation temperature — directly influences the character of the finished sake.

## Rice Polishing (Seimai)

The process begins with {{glossary:seimai-buai}} (rice polishing). The outer layers of the grain, rich in protein and fat, are milled away to expose the starchy core. For a {{glossary:daiginjo}}, this can mean removing 50% or more of the grain over 10-12 hours of continuous milling.

## Washing, Soaking, and Steaming

Polished rice is washed to remove residual {{glossary:nuka}} (bran dust), then soaked in water for a precisely timed period — sometimes measured in seconds for highly polished rice. The soaked rice is then steamed, not boiled, to achieve the firm-outside, soft-inside texture ideal for koji cultivation.

## Koji Making (Seikiku)

Steamed rice is brought to the {{glossary:koji-muro}} where {{glossary:tane-koji}} spores are sprinkled over it. Over approximately 48 hours, {{glossary:aspergillus-oryzae}} mold colonizes the grains, producing enzymes that will convert starch to fermentable sugar. This is universally regarded as the most critical step in brewing.

## Yeast Starter (Moto/Shubo)

A concentrated mixture of steamed rice, koji, water, and yeast creates the {{glossary:moto}} — a nursery where billions of yeast cells propagate. Whether the brewer uses {{glossary:sokujo}} (modern fast method), {{glossary:kimoto}} (traditional pole-ramming), or {{glossary:yamahai}} (modified traditional) fundamentally shapes the sake's flavor foundation.

## Main Fermentation (Moromi)

The {{glossary:moromi}} mash is built over four days using the {{glossary:sandan-jikomi}} three-stage addition process. Over the following 18-32 days, parallel fermentation works its magic as koji enzymes and yeast operate simultaneously. The {{glossary:toji}} monitors temperature, gravity, and acidity daily.

## Pressing, Filtration, and Pasteurization

When fermentation is complete, the moromi is pressed ({{glossary:joso}}) to separate clear sake from the lees. Most sake then undergoes {{glossary:hi-ire}} (pasteurization) and is diluted with {{glossary:warimizu}} to the desired alcohol level before bottling.