Amazake (甘酒, literally "sweet sake") is a traditional Japanese drink made from fermented rice — either through koji enzyme activity or from sake lees (sakekasu). Despite containing the word sake, traditional amazake made with koji is non-alcoholic or very low-alcohol (under 1%). It's sweet, thick, slightly tangy, and nutritionally substantial — often called Japan's "original energy drink."
The drink's history extends over a thousand years. It appears in Nihon Shoki (720 CE) and has been consumed at shrines, festivals, and as a restorative throughout Japanese history.
The Two Types of Amazake
Koji Amazake (米麹甘酒)
Made from: Cooked rice fermented with koji (Aspergillus oryzae) at a controlled temperature (55-60°C) for 6-12 hours.
Process: Koji produces amylase enzymes that break down rice starch into glucose and maltose — the natural sweetness comes entirely from the enzymatic digestion of the rice's own starch. No sugar is added; sweetness develops through fermentation.
Alcohol: Essentially zero. The low fermentation temperature and short time period don't allow for significant alcohol production.
Flavor: Very sweet, slightly thick, with a clean rice flavor. The sweetness can be surprising — it's quite intense from the concentrated glucose.
Nutrition: High in glucose (immediately available energy), B vitamins (B1, B2, B6), amino acids released from protein breakdown, and resistant starch. Traditional Japanese nutritional wisdom considers this type the most nourishing.
Sake Lees Amazake (酒粕甘酒)
Made from: Sake lees (sakekasu) — the pressed solids remaining after sake production — dissolved in hot water and sweetened with sugar.
Alcohol: Contains residual alcohol from the sake production (1-8% ABV). Not appropriate for children, pregnant women, or those avoiding alcohol.
Flavor: More complex, with yeasty depth, a slight alcoholic warmth, and fermented character different from koji amazake. Requires sugar addition because sake lees are not intrinsically sweet.
When to encounter: This version appears at winter festivals and shrine celebrations (shinto hatsumode, New Year's visits). The warmth and slight alcoholic character make it the specifically winter-festival version.
Seasonal Context
Winter (Hatsumode / New Year): Amazake is traditionally served hot at shrines during hatsumode (初詣, the first shrine visit of the new year) in small paper cups. The crowds queuing in winter cold, warmed by cups of hot amazake, is one of Japan's iconic New Year images. The sake lees version appears here — the slight alcoholic warmth is part of the experience.
Summer (Cooling drink): Koji-based amazake is increasingly popular as a cold summer drink. The glucose-rich content provides quick energy in summer heat; the clean sweetness works chilled. Chilled amazake in small bottles is a Japanese convenience store staple in summer.
Hinamatsuri (Girls' Day, March 3): Hot amazake is traditionally served at Hinamatsuri doll festival celebrations — a sweet, non-alcoholic drink appropriate for children.
Making Koji Amazake at Home
Home production requires a way to maintain steady temperature at 55-60°C for 6-12 hours. Rice cooker warm setting, yogurt maker, or a well-insulated container work.
Ingredients:
- 200g hakumai (white short-grain rice)
- 200g kome-koji (rice koji / malted rice) — available at Japanese grocery stores, health food stores, or online
- 500ml water
Method:
-
Cook rice. Cook rice in 300ml water (slightly less water than normal for a firm, dry result). Cool to 60°C — it should feel very warm to touch but not burning.
-
Mix with koji. While rice is still warm (50-60°C — critical: too hot kills koji enzymes; too cool produces inadequate saccharification), mix thoroughly with kome-koji and 200ml warm water.
-
Ferment at 55-60°C. Transfer to a rice cooker (keep on "warm" setting, not "keep warm" — check your model), a yogurt maker, or an insulated container. The temperature must stay at 55-60°C for 8-12 hours.
-
Check at 6-8 hours. Stir; taste. The mixture should be distinctly sweet — if not yet sweet enough, continue 2-4 more hours.
-
Finish. When sufficiently sweet, bring to a brief simmer to stop enzyme activity (this halts the fermentation at the current sweetness level) or refrigerate directly if you want to stop but not heat-treat.
Serving: Serve hot or cold. Thin with additional water to desired consistency. A pinch of grated fresh ginger stirred in adds warmth and balance.
Buying Amazake
Commercial amazake is available in two formats:
Bottled ready-to-drink: Sold in small bottles or cartons, often at Japanese grocery stores and online. Both koji-type (low-sugar, cloudy) and sake-lees-type (requires reading the label to determine which).
Paste/concentrate: Higher concentration; dilute with water or milk before drinking.
Recommended brands: Marukami, Hakutsuru, and various regional sake breweries produce sake lees amazake. For koji amazake, artisan health-food focused brands are common.
Culinary Uses Beyond Drinking
Amazake has applications beyond a beverage:
Marinade: Using koji amazake as a marinade for fish or chicken introduces the koji enzymes to the protein, which tenderize muscle fibers and add glutamate umami. Marinating salmon in amazake for 1-2 hours before grilling produces an exceptionally tender, slightly sweet-glazed result.
Baking: Amazake can replace some sugar in bread and cake recipes, contributing fermented depth and moisture-retaining properties.
Smoothies: Blended into fruit smoothies as a natural sweetener — the glucose adds immediate sweetness without refined sugar.
Dressing: Diluted and seasoned with miso and rice vinegar → a naturally sweet salad dressing.
Amazake is one of those Japanese foods where the gap between common knowledge and actual prevalence is enormous. Westerners rarely encounter it, yet in Japan it's sold everywhere in summer, appears at every major shrine event, and has been consumed continuously for over a thousand years. The koji-based version specifically represents Japan's deep understanding that fermentation's most valuable products aren't always alcohol — sometimes they're glucose, vitamins, and amino acids.
Related reading: Japanese Sake Guide | Koji Fermentation in Japanese Cooking | Japanese Shrine Food Culture
The full recipes live in the book.
Get Tokyo Meets Tuscany on AmazonPaperback $24.99 · Hardcover $34.99 · eBook $9.99