Dassai 23 Centrifuge (720 ml)

When a competitor reached 24% seimaibuai, Hiroshi Sakurai extended Dassai's polishing run a final 24 hours to land at 23% — a deliberate act of one-upmanship that consumed 168 continuous hours of milling and discarded 77% of each Yamada Nishiki grain, leaving only the starch-pure core. That decision effectively reset the ceiling for ultra-polished sake globally and catalysed the modern premium sake boom.

The brewery sits in a mountain valley in Shuto-cho, Iwakuni City, Yamaguchi Prefecture — a region classified for its soft 'Seiryu' mountain water, purified further on-site. Soft water produces a gentler, more delicate fermentation, amplifying the gossamer texture that extreme polishing makes possible.

Production is built around deliberate craft at scale: rice washed in 10 kg units, soaked approximately 15 minutes, with koji applied by hand — human skin temperature and touch considered non-negotiable. Two parallel brewing teams run simultaneous moromi batches at differing water-absorption rates and fermentation temperatures, comparing results in a data-driven artisan loop. Crucially, Dassai was the first sake brewery in Japan to press commercially via centrifuge, separating sake from mash without any applied pressure, preserving the most volatile aromatic compounds intact. Bottling follows the proprietary Hayata method (Patent 2013-008455): filled cold below 5°C, hot-shower pasteurized, then rapid-cooled — locking freshness at the moment of peak expression.

Dassai produces exclusively Junmai Daiginjo across its entire commercial range — no added alcohol, no lower-grade expressions — a single-tier commitment considered extraordinary even within Japan's most prestigious breweries.