
KUSU
Kusu: time in clay.
Since 1 August 2015, only awamori with its entire contents aged three years or more may be called kusu.

12AWAMORI — OKINAWA
Awamori is Okinawa's distilled spirit: rice is made entirely into koji with black koji mould, fermented as an all-koji mash, then distilled in a pot still.
Long-aged awamori is called kusu, and it has been handed down with shitsugi — the practice of topping up older jars from younger ones. Labeling kusu follows an industry standard.

古酒(クース)
Since 1 August 2015, only awamori whose entire contents have been stored for three years or more may be labeled kusu. An age statement must reflect the youngest awamori in the blend.
Source: Okinawa Prefecture Distillers Association ↗
ABV, polishing ratio, vintage, age and similar details appear only when confirmed by an official source.

A row of Okinawan awamori isshobin bottles on a counter beneath paper lanterns

Awamori stored inside the limestone cave Nisshū-dō at Kin Kannon-ji
Photo: Muramasa / CC BY-SA 3.0 · 金武町(沖縄県)

Four cups of different awamori set out for tasting on a wooden tray

Cave-like cellar where awamori matures at Taragawa distillery
Photo: Object In Space / CC BY-SA 4.0 · Miyakojima, Okinawa

An 18th-century glazed ceramic karakara spirit pourer
Photo: Manufacture Kawahara / Public domain · パリ・チェルヌスキ美術館

Awamori served from a black clay karakara with a glass on ice

An awamori serving set: karakara pourer, ice bucket and blue Ryukyu glasses on a tray

A glass of awamori on ice in Ryukyu glass beside a bottle of Kikunotsuyu

A dark bottle of Kumejima no Kumesen awamori with a stemmed glass on a table
Photo: Bapak Alex / Public domain · モスクワ(ロシア)のレストラン

Factory entrance with the "Kumejima no Kumesen" awamori sign
Photo: veroyama / CC BY-SA 2.0 · 久米島町(沖縄県)

A bottle of Omoto awamori from Ishigaki Island

Pre-war black-and-white photograph of stills in an Okinawan awamori works

Sakimoto Awamori Distillery near Ryukyu Mura, with red-tiled roof and jars
Photo: Yuet Man Lee / CC BY-SA 4.0 · 沖縄県(琉球村近く)

Exterior of Seifuku Distillery on Ishigaki Island
Photo: Ray_go / CC BY-SA 3.0 · 石垣市(沖縄県)

A bottle of Zuisen awamori on an izakaya counter
Photo: ayustety from Ginza, Tokyo / CC BY-SA 2.0 · 東京都中央区銀座(沖縄料理店)

Exterior of Zuisen Distillery along a stone-walled lane in Naha
Photo: BehBeh / CC BY-SA 3.0 · 那覇市(沖縄県)

Awamori jars (kame) and bottles lined up in the Zuisen Distillery showroom
Photo: BehBeh / CC BY-SA 3.0 · 那覇市(沖縄県)