What Is Sake?

Sake (酒, also called nihonshu / 日本酒) is Japan’s national alcoholic beverage — a fermented rice drink with a history stretching over 2,000 years and a complexity of flavor that rewards exploration as much as wine. Unlike most alcoholic beverages in the world, sake is made through a fermentation process unique to Japan, and understanding even a few basics transforms a casual glass into a genuine tasting experience.

How Sake Is Made

Sake is made from rice, water, koji mold (Aspergillus oryzae), and yeast — four ingredients producing a beverage of considerable complexity. What makes sake biochemically unique is multiple parallel fermentation: unlike wine (where yeast simply converts fruit sugar to alcohol in a single step) or beer (where enzymes convert starch to sugar first, then yeast converts sugar to alcohol in sequence), sake does both simultaneously in the same vessel. Koji mold breaks down rice starch into fermentable sugars while yeast simultaneously converts those sugars into alcohol. This parallel process allows sake to develop more complex flavor compounds than either sequential process permits.

The most important quality indicator in sake is the seimaibuai (精米歩合, rice polishing ratio) — the percentage of each grain of rice remaining after milling. Sake rice is polished to remove the outer layers (which contain proteins and fats that produce unwanted flavors in fermentation). A seimaibuai of 60% means 40% of the grain has been polished away, leaving only the starchy core. The lower the seimaibuai percentage, the more premium the sake — and the more rice is used per liter produced, which is why premium sake is expensive.

Sake Classifications

How to Drink Sake

Temperature is the most important variable in sake service. Heavy, rich junmai and honjozo sake open up when served warm — the traditional categories are nuru-kan (40°C, warm) and atsu-kan (50°C, hot). Heat amplifies the savory, earthy elements and makes a winter cup deeply comforting. Ginjo and daiginjo are almost always served chilled (10–15°C) to preserve their delicate fruit and floral aromas, which evaporate at higher temperatures. Serving a premium daiginjo hot would be considered a waste.

The traditional vessels: a tokkuri (徳利, ceramic flask) for heating and pouring, paired with small ochoko (お猪口, cups). The masu (枡, square cedar box) is the most photogenic form and adds a pleasant cedar fragrance, though it concentrates the alcohol vapors more than a cup. The custom of pouring for others before yourself — keeping your neighbor’s glass full — is as important in sake service as in sake culture.

Food pairing follows the same principle as wine: lighter sake (shio and ginjo) pairs with raw fish, tofu, and delicate dishes; fuller junmai pairs with grilled meats, rich stews, and aged cheeses; nigori pairs well with spicy food and desserts. The general rule “what grows together goes together” applies — sake pairs naturally with Japanese cuisine.

Visiting a Sake Brewery

The best sake-producing regions for brewery visits include: Nada (灘, Kobe and Hyogo Prefecture) — Japan’s largest sake region, with numerous breweries open to visitors along the Sake Highway near Nada Station; Fushimi (伏見, southern Kyoto) — Japan’s second major region, known for its soft mineral water and elegant sake; Niigata — famous for tanrei (淡麗, clean and dry) style; and Akita — in the rice-growing north, known for fragrant sake in a cold climate.

You can identify a sake brewery by the sugi-dama (杉玉) — a large ball of cedar branches hung above the entrance, which turns from green to brown as it ages. A green sugi-dama means new sake (shiboritate) has just been made; a brown one means the brewery has been producing for the season. This tradition dates from the Edo period when sake was sold seasonally and the cedar ball signaled fresh availability.