Kurozu is Japanese black vinegar made using a 200-year-old technique of naturally fermenting ingredients outdoors in giant clay pots. It takes at least a year until it’s complete, with some of the best batches aging from three to five years. Sakamoto Kurozu is one of eight vinegar makers that haven’t changed the process.

For more information visit http://www.kurozu.co.jp/eng/rekishi.html, and to purchase a bottle visit http://www.tsubobatake.jp/shop/item/sakamotonokurozu/.

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How Japan’s Rarest Vinegar Ages For 3 Years On A Field Of 52,000 Clay Pots | Still Standing