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Provenance  ·  An unbroken lineage

Eight generations.
One unbroken culture.
Since 1817.

A slow record of patience, kept in cedar and cypress — a family brewery that has refused to hurry for 207 years.

A letter from the cellar

Why we have never blended, never rushed, never diluted.

For eight generations our family has tended the same mother culture of kōji in Shigaraki. We have not rewritten the recipe, shortened the seasons, or opened a faster tank. Every bottle we ship carries the patience of a cellar that has been quietly working at fourteen to sixteen degrees for two hundred years — a temperature the mountain provides for us, because the mountain was here first.

We are not against progress. We are against the kind of vinegar that has forgotten where it came from. Our work is simply to keep a thread unbroken: a single mother of Aspergillus oryzae, a single cellar, a single family learning the same craft from one set of hands to the next. The flavor you taste is the flavor of continuity itself.

If you have come here to learn whether we are who we say we are — the eight generations, the unbroken kōji, the cedar barrels still breathing — the rest of this page is for you.

The place  ·  Shigaraki

The Shigaraki foothills — a microclimate the brewery did not choose, only inherited.

A ridge above Lake Biwa, a cedar forest to the north, a clay-heavy soil that breathes humidity into the cellar walls. The brewery sits where it has always sat. The mountain decides the temperature. We only listen.

The Shigaraki foothills at golden hour, looking toward the Tetujin brewery in the valley
The foothills above Lake Biwa, where the brewery is rooted.
A cedar forest on the ridge above Shigaraki at golden hour
The cedar forest that supplies our aging barrels.
The exterior of the Tetujin brewery in Shigaraki, late afternoon
The brewery exterior, unchanged in footprint for generations.

The lineage  ·  I. through VIII.

Eight generations, one unbroken kōji mother culture.

From the founder's first cedar vat to today's apprentice brewers, the line below names every head of house and the single contribution that defined their tenure. The current owner is the eighth.

  1. I

    Jiemon Tetujin  1817 – 1844

    Founder. Built the original brewery on the Shigaraki ridge and propagated the first cedar-vat mother culture, which has never since been remade.

  2. II

    Kichisaburo Tetujin  1844 – 1871

    Carried the brewery through the late Edo and into the Meiji restoration; refused to substitute cheaper grain when the rice crop failed.

  3. III

    Heishiro Tetujin  1871 – 1902

    Expanded the cedar forest lease and codified the seasonal brewing calendar that the house still follows.

  4. IV

    Seijiro Tetujin  1902 – 1933

    Doubled barrel inventory in cedar, enabling the house's first true 36-month reserves.

  5. V

    Gennosuke Tetujin  1933 – 1962

    Stewarded the kōji mother through wartime rationing without laboratory intervention; the culture survived the 1940s intact.

  6. VI

    Toranosuke Tetujin  1962 – 1988

    Opened the first single-lot bottling program; began hand-stamping lot numbers on each barrel head.

  7. VII

    Masahiro Tetujin  1988 – 2019

    Began international export to specialty retailers; received the inaugural Shigaraki-Gōshu designation in 2001.

  8. VIII

    Kenji Tetujin  2019 – present

    Current owner. Brought three Living National Treasure apprentices into the 14-brewer team and launched the QR-linked lot Certificate of Analysis in 2022.

By the numbers

Hard facts that frame the craft.

207

Years of continuous family ownership since 1817

14

Full-time brewers, including three Living National Treasure apprentices

14 – 16°C

Year-round cellar temperature, maintained by the mountain, not by climate control

18,000L

Annual production across six product lines, never beyond the cellar's capacity

Hand-stamped cedar and cypress aging barrels in the Shigaraki cellar

The barrel  ·  The patience

Twelve to thirty-six months. The barrel decides when it is ready.

A Tetujin barrel is cedar or cypress, joined without metal, sealed with a waxed rice-starch head. Inside it, steamed rice, water and our 207-year-old kōji begin a slow conversation that no instrument can hurry. We taste every barrel at three, six, twelve, twenty-four and thirty-six months — and we blend nothing across years. A bottle labeled twelve months is twelve months; a bottle labeled thirty-six is thirty-six.

Industrial vinegar finishes in twenty-four to seventy-two hours. Ours cannot. The amino acids, organic acids and esters that give slow vinegar its depth are produced by time, not by speed — and they cannot be added back after the fact. We do not add caramel, do not add preservatives, do not dilute with water, and do not pasteurize above the cellar's own warmth. Acidity lands between 4.8 and 5.2 percent, verified by an independent laboratory and shipped, by lot, inside every order.

If the cellar's rhythm feels slow to a modern kitchen, it is. That is the entire point.

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