Koji: the key ingredient in Japanese alcoholic beverages

Nihonshu, shochu, and iawamori are part of Japan’s iconic alcohols, but their secret lies in a unique ingredient: koji. This microscopic fungus plays a fundamental role in the fermentation of rice and gives these drinks their distinctive taste. Find out how koji shapes the identity of Japanese alcoholic beverages and where to learn more about these traditions during a trip to Japan.

Koji: a closet in the heart of Japanese culture

Thekoji (Aspergillus oryzae)is a fungus used in the fermentation of many Japanese preparations. In addition to alcoholic beverages, it is essential for the production ofmiso, ofshoyu (soya sauce)andmirin (a sweet seasoning based on fermented rice).

In the case of Japanese alcohol, koji plays a crucial role: it transforms rice starch into fermentable sugars, allowing yeasts to initiate alcoholic fermentation. This process, calledsaccharification, is at the heart of the making of sake, shochu and l’awamori.

Japan is one of the few countries wheresaccharification and fermentation take place simultaneously, a phenomenon calledparallel multiple fermentation. This distinguishes nihonshu from other spirits produced from cereals such as beer, where the conversion of starch to sugar and fermentation are distinct stages.

The sake: refined and emblematic alcohol

ancestral know-how

Thenihonshu (日本is often referred to as “rice wine”, although its manufacturing process is closer to that of beer. It consists of three main elements:

• Rice: carefully polished to remove impurities and reveal the heart of starch.
• Water: an essential ingredient that influences the final taste of nihonshu. The regionsKyoto (Fushimi)andHyogo, Nadaare known for the purity of their sources.
• The Koji: it promotes the saccharification of rice and determines some of the aromas of nihonshu.

The blending of nihonshu is based on know-how transmitted from generation to generation. Thetoji (buffalo masters), real artisans, perfect their technique over the years to produce exceptional cuvées.

Major categories of sake

According to its method of manufacture and rice polishing rate, nihonshu is divided into several categories:

• Junmai: pure nihonshu, without added distilled alcohol.
• Honjozo: a little alcohol added to refine the aromas.
• Ginjo and Daiginjo: more refined nihonshus, made with very polished rice (respectively 60% and 50% or less of its original grain).
• Nigori: an unfiltered nihonshu, more cloudy and slightly sweet.

Where to discover the sake in Japan?

Many breweries open their doors to visitors. Here are some of the best addresses to discover this ancestral art:

• Fushimi (Kyoto)This area is home to some of Japan’s most famous breweries, such asGekkeikan Okura Sake Museum, where you can taste several varieties.
• Nada, Kobe: renowned for its excellent quality water, this region produces a nihonshu with subtle aromas. The breweryHakutsuruoffers an immersive visit.
• Obata Shuzo (Niigata, Sado Island): a unique brewery installed in an old school, offering courses on the brewing of nihonshu.
• Noguchi Naohiko Sake Institute (Ishikawa): led by a legendary master brewer, this place offers tastings in an exceptional setting.

Shochu: Distilled Alcohol with Multiple Faces

Regional alcohol with a thousand flavours

Less known internationally than nihonshu, theshochuis the most distilled alcohol consumed in Japan. It is distinguished from nihonshu by its distillation and the use of a wider variety of ingredients.

The shochu can be developed from:

• Rice (kome shochu)
• Barley (mugi shochu)
• Sweet potato (imo shochu)
• Sarrasin (soba shochu)
• Chestnut, brown sugar or even chestnuts, depending on the region

The type of koji used also influences the taste:

• Yellow Koji: gives soft and light flavors.
• Black Koji: brings powerful and deep aromas.
• White Koji: a softer version of the black koji.

Best destinations to discover the shochu

• Kagoshima: known for itsImo Shochubased on sweet potatoes, this region has many distilleries open to visitors. DistilleryWakashio (Shibushi City)even allows you to create your own custom shochu.
• Miyazakispecialized in barley-based shochu, it is famous for its craft production and its unique ageing methods.
• Kumamoto: rice shochu land, to taste in one of the many specialized bars in the region.

Lawamori: traditional alcohol of Okinawa

A drink of a unique character

Lawamoriis a typical alcohol from the Okinawa archipelago. Unlike shochu, it is exclusively made fromThai riceandkoji black. Its taste is richer and its aging in clay jars gives it a unique aromatic depth.

Awamoris aged for more than three years are calledkusuand are very appreciated by connoisseurs. Some cuvées may exceed 20 years of age, thus developing aromas comparable to the best whiskies.

Explore theawamori in Okinawa

• Naha, Okinawa: the capital of the archipelago houses several famous distilleries, likeZuisenandShikina, which offer visits and tastings.
• Helios Distillery (Nago, Okinawa): a must-see place to discover the history and the process of manufacture of iwamori.

Koji and UNESCO recognition

The importance of koji in Japanese culture was officially recognized in December 2024, whentraditional Nihonshu manufacturing know-how with kojihave been included in UNESCO’s intangible cultural heritage. This distinction underlines the essential role of this ingredient in Japan’s gastronomic identity.

Why go to discover Japanese spirits?

Exploring the nihonshu, the shochu and theawamori in Japan is much more than just a tasting of alcohol. It is an immersion in a refined craft, a journey through the terroirs and traditions of the country. From Kyoto to Kagoshima and Okinawa, each region has its own flavours and know-how.

Whether you’re a nihonshu enthusiast, curious to discover the shochu or intrigued by the yawamori, a trip to Japan is a unique opportunity to taste these cultural treasures and learn more about their manufacture.

If this article has brought you useful information and can help other travellers prepare for their stay, a Google review will always be appreciated.

Leave a Google Review