Rice-koji amazake
Cooked rice, rice koji and water are held warm for hours so koji enzymes turn the rice starch to sugars, giving a naturally sweet Japanese drink with no added sugar and no second fermentation.
Equipment · All-in-one appliances
Rice cooker
Electric rice cooker · Jeongi bapsot
A modern electric pot that cooks rice and may provide a model-specific keep-warm stage. Documented Japanese and Korean recipes use it for koji amazake, sikhye and ssal-jocheong; measure warm settings rather than assume.
A modern pot with a second setting
A domestic electric rice cooker combines a heated base, a removable inner pot and a lid. In a straightforward rice cycle, the appliance heats the water and grain; once its cooking control changes state, a keep-warm setting may maintain heat. This is modern manufactured equipment, not a single timeless vessel design. Models differ: simple cookers, fuzzy-logic models and multicookers can have different sensors, programs and warm behavior. The references here document generic cooker uses and one disassembled cooker, not a particular brand or a universal temperature.
That distinction matters when a cook uses the appliance for a process beyond its intended rice cycle. A warm indicator is not a thermometer, and the word “keep warm” does not define a food temperature. The inner pot’s measured contents, not the control label, determine what temperature a recipe stage has reached.
Sources for this section
Koji amazake: monitor an open warm hold
Marukome documents one Japanese home method for koji amazake using a rice cooker. The cook mixes cooked rice with hot water, lets the mixture settle near 60 °C, then adds rice koji. For the conversion stage, Marukome describes an open lid with a cloth cover, intermittent stirring and a target range around 50–60 °C over five to ten hours. If the mixture runs hot, the directions say to switch keep-warm off and stir to cool; if it falls, briefly closing the lid can bring it back up.
This is a recipe-specific management technique, not a promise about an appliance’s built-in program. Marukome explicitly warns that temperature control varies among cookers and recommends consulting the manual. Use a thermometer in the mixture and observe its movement through the hold; never infer a safe or suitable temperature from a lamp or button.
Sources for this section
Korean malt-and-rice preparations
Maangchi documents rice cookers in two Korean preparations. For sikhye, rice is cooked in the cooker; clear liquid from settled barley malt powder is poured over it, and the warming setting holds the mixture while malt enzymes convert starch. Maangchi checks after about four hours, looking for some rice grains to float, and allows more time if needed. The recipe then moves the hot mixture to a pot for boiling. It also gives a stovetop alternative, so the rice cooker is a convenient documented option rather than a required traditional vessel.
For ssal-jocheong, Maangchi describes a warm conversion hold followed by straining and reducing the liquid in the open cooker. These steps illustrate how a single appliance can cook rice, provide a warm interval and, with its lid open, reduce syrup. They do not establish the temperature of any cooker model. Both recipes name a ten-cup cooker or warming setting only as needed for that method; they do not provide a general specification for capacity or temperature.
Sources for this section
Use the right control for the stage
Keep-warm programs are designed around cooked rice, and their behavior is model-specific. Marukome directs users to their manual and uses a thermometer; that is especially important when an enzyme conversion depends on a limited temperature window. A multicooker’s automatic keep-warm range can be higher than a koji recipe’s target, so do not assume a rice-cooker method transfers unchanged to a pressure cooker or another appliance. The published Instant Pot Duo manual, for example, gives a Keep Warm range of 145–172 °F (63–78 °C), illustrating that the label alone cannot establish suitability.
Describe a cooker by its actual controls and measured performance rather than by a generalized promise. The reference photo shows one cooker with its bowl and steam insert removed; it is useful for understanding component relationships, not as evidence that every modern cooker includes an identical insert. No capacity, dimensions or commercial model are claimed for this entry.
Equipment details
CapacityCapacity varies by model. The sources describe recipe-specific cooker sizes but no standard capacity for the equipment category.
SizeDimensions vary by model; no representative dimensions are established by the sources.
PowerElectric The cooker uses mains electricity; exact heating and control design varies by model.
How you get oneBought, manufactured A contemporary manufactured household appliance; the cited sources do not establish one manufacturer or model as representative.
CareFollow the specific model’s manual for cleaning and operation. Use only its intended cooking and warm settings; do not immerse powered components.
Made of
- Electric heating base and outer housing — Heats and supports the removable cooking pot
A particular disassembled model in the cited public-domain photograph shows this arrangement. - Removable inner cooking pot — Holds rice and other contents during cooking or a warm stage
The cited photograph documents one example; coatings and materials vary by model. - Lid — Covers the cooking pot during operation
The referenced model has an opened lid; recipe instructions may require an open lid during supervised warm holds.
Limits
Keep-warm temperature and control behavior vary by model; an indicator light does not establish the temperature of the food.
Source →The cited recipe methods do not establish a universal cooker temperature, capacity or program for enzyme conversion.
Source →An automatic multicooker Keep Warm setting may exceed a recipe’s target; the Instant Pot Duo manual specifies 63–78 °C for that model family.
Source →Places
Japan
Documented use · Country evidenceRecipe use example, not a place of origin claim.
Korea
Documented use · Country evidenceCulturally specific recipe examples, not a single traditional cooker design or exclusive national use.
Related
Used for
Sikhye
A Korean sweet rice drink made by holding cooked rice in water drawn off barley malt until the grains float, then boiling and chilling it.
Ssal-jocheong (rice syrup)
A Korean rice syrup: cooked rice is converted by barley malt in a long warm hold, strained, and the sweet liquid is boiled down until it pours like maple syrup.
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Sources
Marukome Co., Ltd.Documented use · Temperature handling · Safety
How to make koji amazakeMarukome's rice-cooker method manages koji amazake at 50–60 °C with the lid open under a cloth, checking and stirring for 5–10 hours.
It warns that cooker temperatures vary by model and recommends consulting the manual and measuring with a thermometer.
Cited in: A modern pot with a second setting; Koji amazake: monitor an open warm hold; Use the right control for the stage
MaangchiDocumented use · Korean recipe · Temperature
Rice punch (Sikhye: 식혜)Maangchi documents rice cooked in a rice cooker, then held with settled barley-malt water on the warming setting; check at four hours and extend if needed.
The recipe also describes a pot-on-stove method and says its warming period is for amylase conversion rather than cooking; cooker brand and temperature are not specified.
Cited in: Korean malt-and-rice preparations
MaangchiDocumented use · Korean recipe
Homemade rice syrup (Ssal-jocheong)This Korean rice syrup recipe uses a rice cooker warm stage for six hours, then strains the liquid and reduces it with the lid open in the cooker.
The recipe is a documented use example, not evidence that every model has the same temperature or control.
Cited in: Korean malt-and-rice preparations
Wikimedia CommonsVisual reference · Construction
File:E reiskocher.JPGThe 2005 photograph shows one electric rice cooker disassembled: outer housing, removable inner bowl, steam insert and opened lid.
The uploader dedicated the image to the public domain. The image documents this particular modern product, not all cooker forms.
Cited in: A modern pot with a second setting
Marukome Co., Ltd.Temperature handling · Model variation
Temperature setting when making amazake in a rice cookerMarukome's FAQ says rice-cooker keep-warm temperatures differ by model, recommends a thermometer and manual, and gives steps for adjusting the lid if the mixture is too hot or cool.
Cited in: Use the right control for the stage
Instant PotModel specification · Temperature
Programmable Electric Pressure Cooker User Manual, Models IP-DUO60/80This manual specifies Keep Warm at 145–172 °F (63–78 °C) for the named Instant Pot Duo model family; this is an example specification, not a rice-cooker standard.
Cited in: Use the right control for the stage