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Tatenokawa “Zenith” Komyo Dewasansan

March 12, 2018

Tatenokawa Komyo Zenith label

This year marks a world first – the first sake ever to be polished down to a mere 1% – Tatenokawa “Zenith” Komyo Dewsansan

It is difficult to overplay the level of technical complexity and, thus, achievement associated with this astonishing accomplishment. Tatenokawa are well known for pushing the boundaries of what is achievable with highly polished rice. They had already produced an 8% polished and a 7% polished sake but, 1% is a whole different level.

When the 1% was announced, I took the opportunity to ask both Jumpei Sato, Tatenokawa’s CEO & Head Brewer, and Takeshi Sato (no relation), Tatenokawa’s number 2 a number of questions.

Why 1%?

Junpei Sato: In the history of sake, no brewery has ever achieved a rice polishing of 1% before so Zenith is a world first. Over many years we’ve been building relationships with local farmers so that we’re now at a stage where the vast majority of the rice we use is grown, under contract, by these local experts. Dewasansan is a local sake rice from Yamagata Prefecture which is steadily being recognised, in the sake-making community, as a rice of excellent quality – possibly even to challenge the likes of the famous Yamadanishiki!

Last year, our contracted farmers, and local retailers, challenged us to show the world just how excellent Dewasansan is: Zenith is our answer to their call. We use their Dewasansan First Class rice for Tatenokawa “Zenith” Komyo Dewasansan.

Also, frankly, we wanted to challenge ourselves and see if it could be done!

Just how small is 1%?

Here are some illustrative images:

100% to 1% polished rice. komyo rice polishing

1% and 100% (unpolished) Dewasansan rice

Kazunoko (herring roe) – when I asked how big the 1% polished rice was, this is the image I received by way of reply!

It’s small, really REALLY small! Although, on seeing the rice, some people people expect it to be even smaller, “That’s not a hundredth of the size!” they exclaim. It’s worth remembering that it 1% by weight, not by volume.

How long does it take to polish down to 1%?

Junpei Sato: 75 days (1800 hours) of continuous polishing

Takeshi Sato: In fact, as you can imagine, the rice polishing was extremely complicated. We’ve invested in some excellent polishing machines but because the machine is not designed to polish down to single digits there were some interesting challenges. The machine will automatically cut out if the weight if the rice is too little. For example, when we polish 1200 kg of rice, if we want to polish down to 1%, the amount of rice would become only 12 kg. This doesn’t work for the machine. Also if the amount of rice is too small, it’s easy to damage the rice grain. So, we polish rice in stages, refilling the hopper each time to ensure there is enough rice passing through the machine at each stage:

100% to 20% about 60 days
20% to 4% about 14 days
4% to 1% about 1.5 days

We also rest the rice between each stage so the whole polishing process actually takes an extremely long time!

What were the major challenges you encountered?

Takeshi Sato: The major challenge was koji making (and always is for really highly polished rice) the rice grains are just so small!

Jumpei Sato: We’ve had many years experience working with highly polished rice so most of the problems we could anticipate and plan for.

Takeshi Sato: Yes, for example, it’s very difficult to cultivate koji mould on 1% steamed rice because nutrients are scarce, the rice dries out extremely quickly and it’s difficult to increase the temperature of the rice koji throughout the process. However, washing, soaking and steaming were all very successful, so we kept a watchful eye on the koji, ensuring it’s humidity and used all sorts of techniques – like sandwiching the boxes for the 1% koji between other koji boxes – to increase the temperature of the koji rice.

Jumpei Sato: Temperature and moisture content were also key to ensure the rice didn’t dissolve too quickly when we made shubo and moromi. The average fermentation temperature was 8.3°C, highest 11.0°C and the lowest 6.0°C for the last 8 days. A cold and long fermentation.

What’s next?

Jumpei Sato: We’re experimenting with lots of different ideas, we like to innovate, stay fresh and keep challenging ourselves. I am very excited for the future of my company.


Me too!

Tatenokawa Zenith Komyo Dewasansan