The Brewing Process

Rice Selection & Polishing

Every great sake begins with the rice. We source premium Yamada Nishiki and Calrose rice from California's Sacramento Valley. The outer layers — rich in proteins and fats that create off-flavors — are carefully polished away. For our Kaze daiginjo, we polish each grain down to just 40% of its original size, a process that takes over 48 hours.

The more you polish, the more refined the sake. It's an act of subtraction — removing to reveal.

Washing & Soaking

The polished rice is washed to remove residual bran, then soaked in pristine Sierra Nevada snowmelt water. Timing is everything — we measure soak times to the second with a stopwatch. Too little water and the rice won't steam properly. Too much and it becomes mushy. This is where decades of experience become irreplaceable.

Each batch of rice has its own personality. Tak can feel the right moisture by touch alone.

Steaming

The soaked rice is steamed — not boiled — in a traditional koshiki steamer. We're looking for rice that's firm on the outside and soft on the inside: 'gaiko-nainyu' in Japanese. This dual texture is critical for koji mold to properly penetrate the grain.

The steam rises at dawn. The brewery fills with the sweet, clean aroma of perfectly cooked rice.

Koji Cultivation

The heart and soul of sake making. Steamed rice is brought into the koji room (koji-muro), kept at exactly 30°C and high humidity. Koji mold spores (Aspergillus oryzae) are carefully sprinkled over the rice. Over 48 sleepless hours, Tak tends to the koji like a newborn — turning, monitoring, adjusting temperature. The koji converts rice starch into fermentable sugars.

This is the step that gives our brewery its name. Koji is not just an ingredient — it's a living partner.

Fermentation

Sake undergoes a remarkable process called 'multiple parallel fermentation' — the koji converts starch to sugar while yeast simultaneously converts sugar to alcohol. This happens in stages over 3-4 weeks in our temperature-controlled tanks. The result is a complexity that single-step fermentation can never achieve.

The tanks bubble and breathe. Fermentation is slow, cold, and patient — like winter itself.

Pressing

The fermented mash (moromi) is pressed to separate clear sake from the lees. We use a traditional fune press — a long, wooden box where mesh bags of moromi are stacked and gently weighted. The first sake that flows out (arabashiri) is the most vibrant and prized.

The moment of truth. Months of work distilled into a stream of clear, fragrant sake.

Aging & Bottling

Fresh sake rests in our climate-controlled cellar, where flavors marry and mellow. Some styles age for weeks, others for months. When the sake has reached its peak expression, it's carefully bottled by hand. No shortcuts, no rushing. The sake tells us when it's ready.

Patience is the final ingredient. You cannot hurry what took four generations to learn.