Sake (日本酒, Nihonshu) is Japan’s traditional rice wine — though “wine” is technically inaccurate since, like beer, it is brewed from grain rather than fermented from fruit. Here is a guide to what sake is, how it is classified, and how to read a label.
How Sake Is Made
Sake production has three distinctive features. Rice polishing (精米, seimaibuai): before brewing, the rice is milled to remove the outer layers — the more you mill, the more of the fatty and protein-rich outer layer is removed, leaving a higher proportion of starchy core. The seimaibuai (polishing ratio) is the percentage of the original grain remaining after milling: 60% means 40% was removed. Lower seimaibuai generally indicates higher quality (though not always better sake). Koji mould (麹, Aspergillus oryzae): sake brewing requires converting rice starch to sugar before fermentation (unlike wine where grape sugars are already fermentable). Koji mould is cultured on a portion of the rice; its enzymes break down starch to glucose, which yeast then ferments to alcohol. This saccharification and fermentation happen simultaneously in the same vessel — a process unique to sake brewing called “multiple parallel fermentation.” The resulting alcohol content before dilution: typically 18–20%, making undiluted sake among the highest-alcohol fermented beverages in the world.
The Classification System
Japanese sake has a legal classification system based on polishing ratio and brewing additives. Junmai (純米): sake made with only rice, water, koji, and yeast — no added alcohol. The “pure rice” category. Junmai Ginjo (純米吟醸): Junmai with a polishing ratio of 60% or below (at least 40% of the grain removed). Junmai Daiginjo (純米大吟醸): Junmai with a polishing ratio of 50% or below (at least 50% removed) — the premium category. Ginjo (吟醸): highly polished sake (60% or below) with a small amount of distilled alcohol added to extract aroma compounds — not added for strength, but for fragrance. Daiginjo (大吟醸): premium polished sake (50% or below) with added alcohol. Honjozo (本醸造): polished to 70% or below, with added alcohol — a solid everyday quality. Futsushu (普通酒): table sake with no polishing ratio requirements, often with larger quantities of added alcohol. Most sake sold in Japan is futsushu. The flavour character: Junmai Daiginjo — fruity, floral, delicate, typically served chilled; Honjozo — clean, slightly dry, versatile, can be served warm; Nigori — unfiltered, cloudy, sweeter.
Serving and Pairing
Temperature: the standard advice “sake is served warm” is mostly wrong for quality sake. Premium sake (Ginjo, Daiginjo) is best chilled (8–12°C) — warming destroys the delicate aromatic compounds. Junmai and Honjozo can be served warm (nurukan, 40–45°C) or hot (atsukan, 50°C), which suits lower-tier sake by masking rough edges. The flavour wheel: ginjo and daiginjo tend to express fruity notes (banana, melon, apple, pear from the Kyokai 9 and 10 yeasts); junmai tends toward earthy, rice, and umami notes; aged sake (koshu) develops caramel and dried fruit character. Pairing: sake pairs well with subtly flavoured foods — it doesn’t compete with the dish. Sashimi, steamed fish, tofu, mild cheeses, and oysters are classic pairings. It is poorly paired with heavily spiced or acidic dishes (the structure is too delicate). The Niigata region (Hakkaisan, Koshi no Kanbai) produces some of the most restrained, clean sake in Japan; the Fushimi district of Kyoto (Gekkeikan, Kizakura) produces softer, slightly sweeter styles; Akita produces rich, full-bodied styles.
