What do you need?
- Is amazake alcoholic? → depends on type — see Two Types section
- Make it at home (non-alcoholic) → use koji amazake recipe: 200g koji, 300g cooked rice, 400ml water, 8–10 hours at 58°C
- Use as a natural sweetener → blend smooth, replace 1g sugar with 2g amazake
- Buy it ready-made → Japanese grocery stores or Amazon (Marusan brand for non-alcoholic)
- Safe for babies/children? → koji amazake (non-alcoholic type) yes; sake lees amazake no
Two Types of Amazake: Koji vs Sake Lees
Both products are sold as "amazake" in Japan, but they are made differently and have different alcohol content. Knowing which type you have changes whether it is appropriate for children, pregnant women, or those avoiding alcohol:
| Property | Koji Amazake (米麹甘酒) | Sake Lees Amazake (酒粕甘酒) |
|---|---|---|
| Primary ingredient | Rice koji + cooked rice | Sake kasu (sake lees) + water |
| Alcohol content | 0% — completely non-alcoholic | 1–3% residual alcohol |
| How it is sweetened | Amylase enzymes convert starch to sugar | Sugar added, or naturally sweet from sake fermentation |
| Flavor | Mild, creamy, lightly sweet, milky | More fermented, tangy, trace alcohol warmth |
| Texture | Thick, porridge-like | Thinner, more liquid |
| Color | White to light beige | White to pale yellow |
| Safe for children/babies? | Yes (from ~12 months) | No |
| How to identify on label | Ingredient: 米麹 (rice koji) | Ingredient: 酒粕 (sake kasu) |
| Season traditionally served | Year-round, especially summer | Winter (New Year, Setsubun) |
What Does Amazake Taste Like?
Koji amazake tastes mildly sweet, creamy, and slightly milky — like very diluted rice pudding in liquid form. The sweetness is natural glucose and maltose, less sharp than refined sugar. There is a faint earthy, floral note from the koji. Served warm it is comforting; served cold it is lighter and more refreshing.
Sake lees amazake tastes more fermented with a trace of alcohol warmth. First-time drinkers of koji amazake often compare it to mild horchata or diluted rice congee. It does not taste fermented like miso — it is approachable for people unfamiliar with fermented foods.
For etymology (甘酒 meaning), history, amazake chaya traditions, and full nutritional profile → What Is Amazake
Amazake Recipe: Ingredients and Equipment
Ingredients (yields ~700 ml / 4 servings)
- 200g rice koji (fresh or dried)
- 300g cooked short-grain white rice
- 400ml water (non-chlorinated if possible)
The ratio is approximately 1 part koji : 1.5 parts cooked rice : 2 parts water. For a thinner, more drinkable consistency, increase water to 500ml. For a thick amazake to use as a sweetener in baking, reduce water to 300ml.
Fresh koji produces a more active fermentation and typically finishes sweeter in 8 hours. Dried koji works well but may need the full 10 hours — rehydrate in the measured water for 20 minutes before combining with rice.
Equipment options
- Rice cooker (keep warm mode): most accessible. Prop the lid ajar with a chopstick — most keep-warm settings run 65–72°C with lid closed, which is too hot. With lid ajar, temperature drops to ~58°C.
- Yogurt maker set to 58°C: most reliable temperature control. The best option for repeatable results.
- Thermos: preheat with boiling water, add mixture, seal. Temperature drops over time — re-warm to 58°C every 2–3 hours. Works but requires more attention.
- Instant Pot (yogurt mode, low): the "Low" yogurt mode typically holds 36°C — too low for amazake. Use the "Normal" yogurt mode, which holds ~40–43°C, and extend fermentation to 12–14 hours.
The Critical Temperature: 55–60°C
The entire success of amazake depends on holding the right temperature:
- Below 50°C: lactic acid bacteria grow faster than the enzymes work. The amazake will taste sour rather than sweet. In some cases, it is unsafe.
- 55–60°C (target): amylase works at peak efficiency. The mixture gets noticeably sweeter every 2 hours.
- Above 65°C: enzymes denature permanently. The amazake stops sweetening. If your batch is not sweet after 10 hours, this is almost always the cause.
Step-by-Step Method
1. Cook rice slightly softer than normal. Freshly cooked is ideal; leftover rice from the fridge works if warmed to at least 50°C first.
2. Combine rice, koji, and water in your vessel. Break up clumps. The mixture should look like loose porridge.
3. Hold at 55–60°C for 8–10 hours. Stir every 2–3 hours to redistribute enzymes and prevent hot spots.
4. Taste at 8 hours. If distinctly sweet and koji grains are soft, it is done. If still starchy, continue 1–2 hours more.
5. Stop fermentation: heat briefly to 70°C, or refrigerate immediately.
How to Use Amazake: Beyond Drinking
As a natural sweetener in cooking and baking
Blend finished amazake smooth until it reaches a thick, uniform paste. Use as a sugar substitute at roughly 2:1 by weight (2g amazake replaces 1g sugar). It works in:
- Baking: muffins, rice cakes (mochi), cookies. Reduce other liquids slightly to compensate for the moisture.
- Dressings and sauces: whisk into salad dressings in place of honey or sugar for a mild, malty sweetness.
- Marinades: adds subtle sweetness and promotes browning in grilled dishes. Combine with miso and mirin for a glaze.
- Smoothies: blend cold amazake with fruit for a naturally sweetened drink with B vitamin content.
Amazake pudding
Thick amazake (made with less water) can be set into a soft pudding with agar or gelatin. Combine 300ml blended amazake with 1.5g agar powder, heat to dissolve, pour into molds, and chill. The result is a lightly sweet, delicately flavored Japanese-style pudding — no added sugar needed.
Serving as a drink
- Warm: serve at 60°C in a small bowl or cup with a pinch of grated fresh ginger (the traditional way). Ginger cuts the richness and aids digestion.
- Cold: blend smooth, dilute with cold water to desired consistency, serve over ice. Popular in summer.
- Lattes: steam with milk or oat milk for a koji amazake latte — a naturally sweet hot drink.
Variations
Genmai amazake: replace white rice with cooked brown rice. Nuttier and slightly less sweet — brown rice has less accessible starch. Ferment the full 10 hours.
Pumpkin amazake: add 150g steamed, mashed kabocha to the base mixture. The koji enzymes convert the pumpkin starch too, producing a naturally sweet pumpkin drink.
Sweet potato amazake: same as pumpkin — substitute 150g steamed, mashed satsumaimo (Japanese sweet potato) for an earthy, sweet variation.
Storage
Refrigerated in a sealed glass jar: 5–7 days. The amazake will continue to ferment very slowly in the fridge and may become slightly more acidic by day 5. Freeze in ice cube trays or small containers for up to 3 months.
For the cultural context and history of amazake → What Is Amazake. For the koji behind this recipe → What Is Koji.
Frequently asked questions
Is amazake alcoholic?
It depends on the type. Koji amazake (米麹甘酒) is completely non-alcoholic — it is made from rice koji and cooked rice fermented at 55–60°C, where the koji amylase converts starch to sugar without producing alcohol. Sake lees amazake (酒粕甘酒) is made from sake kasu (the byproduct of sake brewing) dissolved in hot water, and contains a small amount of residual alcohol — typically 1–3%. Both are sold in Japanese shops under the name 'amazake.' Check the label: if the ingredient list shows rice koji as the primary ingredient, it is non-alcoholic. If it shows sake kasu (酒粕), it contains trace alcohol.
What does amazake taste like?
Koji amazake tastes mildly sweet, creamy, and slightly milky — not unlike a gentle rice pudding in liquid form. The sweetness is natural (glucose and maltose from enzyme activity) and less intense than sugar. There is a faint earthy, floral note from the koji that mellows as the drink cools. Sake lees amazake tastes slightly more fermented and tangy, with a trace of alcohol warmth. Neither type is sharp or acidic. First-time drinkers often compare koji amazake to a very mild, unsweetened horchata or a diluted rice congee.
What temperature should amazake ferment at?
55–60°C, with 58°C as the ideal target. Below 50°C, bacteria can grow and produce sour off-flavors. Above 65°C, the amylase enzymes denature and stop converting starch to sugar — you end up with a starchy, bland porridge instead of sweet amazake.
Can I make amazake without a rice cooker?
Yes. A yogurt maker with temperature control is the most reliable alternative — set it to 58°C. A thermos works but requires re-warming every 2–3 hours as the temperature drops. An oven set to its lowest setting (check with a thermometer — it must hold 55–60°C, not higher) is another option. The critical factor is consistent temperature, not the specific equipment.
How do I know when amazake is done?
Taste it. Finished amazake is distinctly sweet — noticeably sweeter than the cooked rice you started with. The texture should be thick and creamy, like a thin porridge. The koji grains should be soft and partially dissolved. If it still tastes starchy or bland after 10 hours, the temperature was likely too high and the enzymes denatured.
What are the health benefits of amazake?
Koji amazake contains glucose and maltose (quickly available energy), B vitamins (B1, B2, B6, and folic acid produced during fermentation), and small amounts of essential amino acids. It has been used historically in Japan as a recovery drink for summer fatigue (natsubate) and for postpartum recovery. Because it is naturally sweet without refined sugar, it is used as a lower-glycemic sweetener in some health contexts. However, it is still calorie-dense relative to its serving size (roughly 130 kcal per 150ml) and should not be consumed in large quantities by people managing blood sugar. It is not a significant source of live probiotics after heat-treatment.
Where can I buy amazake?
Amazake is sold at Japanese grocery stores (Mitsuwa, Marukai, Nijiya Market) and online. The most common brands in the US are Marusan (tetra-pak, shelf-stable koji amazake), Hakutsuru (sake lees amazake), and various Japanese imports through Amazon. Ready-to-drink amazake typically comes in tetra-pak cartons. In Japan, vending machines and convenience stores sell canned or bottled amazake during winter months. For homemade amazake, you need rice koji, which is available at Japanese grocery stores or via Amazon (Koji For Less, Cold Mountain brand).
Is amazake safe for babies and children?
Koji amazake (non-alcoholic type) is widely used in Japan as a natural sweetener for baby food from around 12 months — it is soft, naturally sweet, and requires no added sugar. Japanese parents blend it into porridge, purees, and baked goods. Because it is fermented, introduce it gradually as you would any new food. Sake lees amazake (the kind made from sake kasu) contains trace alcohol and should not be given to infants or young children. Always confirm which type you have before using it in children's food.
Can I use amazake as a sugar substitute in baking?
Yes. Blend the finished amazake smooth, then use it as a 1:2 replacement for sugar by weight (1g sugar = 2g blended amazake, adjusted for the extra liquid). It adds mild sweetness and a slightly malty flavor that works well in rice cakes, pancakes, muffins, and cookies. Because amazake is wet, reduce other liquids in the recipe slightly. It also caramelizes well under heat, producing a gentle golden-brown color in baked goods. This is a traditional technique in Japanese sweets (wagashi) and increasingly used in modern health-food baking.
Where to go next
- What Is Amazake — entity page: cultural history, chaya, seasonal use, nutritional profile
- What Is Koji — Aspergillus oryzae: the mold that makes amazake sweet, miso deep, and sake alcoholic
- Fermentation hub — the full Japanese fermentation landscape at home
- What Is Genmai — brown rice for the genmai amazake variation
- Miso vs Shio Koji — other koji-based seasonings and how they compare