Patience Is the Main Ingredient Sake brewing is not a weekend project. The full process from koji cultivation to finished sake takes 4 to 6 weeks. Rushing fermentation temperatures or skipping rest periods produces harsh, unbalanced results. Read through the entire process before you start so timing surprises do not catch you off guard.
The Four Core Ingredients
Sake is made from four things: polished short-grain rice, clean water, koji mold (Aspergillus oryzae), and yeast. The koji converts starches in the rice to fermentable sugars at the same time yeast converts those sugars to alcohol. This simultaneous saccharification and fermentation is what makes sake unique among fermented beverages, and it is why temperature control matters so much throughout the process.
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Make Your Koji Rice
Steam 200 g of polished short-grain rice until just cooked but not mushy.
Make Your Koji Rice
Steam 200 g of polished short-grain rice until just cooked but not mushy. Cool to 30 C (86 F) and inoculate with 2 g of dried koji-kin spores. Spread the inoculated rice thinly on a clean tray, cover loosely with a damp cloth, and keep at 28 to 32 C (82
Build the Starter Mash (Shubo)
Combine 75 g of steamed rice, 100 g of your finished koji rice, 165 ml of cold
Build the Starter Mash (Shubo)
Combine 75 g of steamed rice, 100 g of your finished koji rice, 165 ml of cold water, and a small packet of sake yeast or dry wine yeast. Mix in a sanitized jar and keep at 10 to 15 C (50 to 59 F) for 10 to 14 days, stirring daily. Cold temperatures
Build the Main Mash in Three Additions
Over three days, add steamed rice, koji rice, and water to the starter in
Build the Main Mash in Three Additions
Over three days, add steamed rice, koji rice, and water to the starter in increasing amounts. Day one: add 200 g rice, 100 g koji, and 240 ml water. Day two: rest with no additions. Day three: add 350 g rice, 170 g koji, and 450 ml water. This three-step
Ferment and Press
Ferment the full mash at 10 to 12 C (50 to 54 F) for 18 to 25 days, stirring
Ferment and Press
Ferment the full mash at 10 to 12 C (50 to 54 F) for 18 to 25 days, stirring gently once daily for the first week. The mash will foam actively then slowly calm. When activity slows and the liquid tastes clean and alcoholic, it is ready to press. Pour the
"Every master brewer will tell you that good sake is made in the cold. Heat is the enemy of clarity, both in the mash and in the mind of the brewer.
"KaiRenner26th of April 2026