Rice alcohol is made by steaming rice, mixing it with a fermentation starter containing mold and yeast, and letting the mixture ferment for one to several weeks. Unlike grape wine, where sugar is already present in the fruit, rice requires an extra step: mold enzymes must first break down the rice starch into sugar before yeast can convert that sugar into alcohol. The good news is that both steps happen simultaneously in the same container, so the process is simpler than it sounds.
One important legal note before you start: in the United States, federal law allows adults to brew fermented rice wine at home for personal use, but strictly prohibits distilling it into a spirit. The process below produces an undistilled rice wine, which can reach 14 to 16% alcohol by volume, comparable to grape wine.
How Rice Turns Into Alcohol
Rice is almost pure starch, and yeast cannot eat starch directly. The workaround is a group of molds, primarily species of Rhizopus and Aspergillus, that secrete enzymes capable of chopping starch molecules into simple sugars like glucose. Once glucose is available, yeast (most commonly Saccharomyces cerevisiae) consumes it and produces ethanol and carbon dioxide. In traditional rice alcohol production, the mold and yeast work side by side in a process called simultaneous saccharification and fermentation. The mold steadily releases sugar, and the yeast steadily converts it to alcohol, all in one vessel.
This is fundamentally different from beer brewing, where a brewer heats malted grain to convert starch before adding yeast in a separate step. With rice alcohol, you introduce both organisms at once through a fermentation starter, and they coordinate the work on their own.
Choosing Your Rice
Most traditional rice wines use glutinous (sticky) rice, and there’s a practical reason for this beyond tradition. Glutinous rice produces a smoother, cleaner-tasting drink. Research comparing ten rice cultivars found that glutinous varieties produced significantly lower levels of higher alcohols (the compounds responsible for harsh, solvent-like off-flavors), staying below 350 mg/L, while some non-glutinous long-grain varieties reached nearly 490 mg/L. Higher starch and amylopectin content in the rice correlated directly with more of these off-flavor compounds.
That said, glutinous rice varieties also produced the highest levels of phenylethanol, a compound with a pleasant rose-like aroma. So glutinous rice gives you fewer harsh notes and more floral character. Short-grain or long-grain glutinous rice both work. Regular white rice will ferment, but expect a slightly rougher flavor profile.
Picking a Fermentation Starter
The fermentation starter is the single most important ingredient. It’s a dried cake or ball containing the mold and yeast your rice needs. Three common options are available depending on what tradition you’re following:
- Chinese yeast balls (jiuqu or Shanghai yeast balls): Small dried spheres sold in Asian grocery stores, typically containing Rhizopus mold alongside various yeasts. These are the easiest to find and the most beginner-friendly. Crush one ball per roughly 2 pounds of uncooked rice.
- Koji (used in Japanese sake): Rice that has been inoculated with Aspergillus oryzae mold. Koji is a pure mold culture, so you may need to add a separate wine yeast for the alcohol-producing step. Sake brewing with koji is more complex and temperature-sensitive.
- Nuruk (Korean starter): A wheat-based disc containing a diverse ecosystem of molds, yeasts, and lactic acid bacteria. Nuruk fermentations can reach the highest alcohol levels, around 16.5% ABV in one study, compared to 14.2 to 14.6% for koji-based fermentations over the same 22-day period. The tradeoff is a more complex, sometimes funkier flavor.
For a first attempt, Chinese yeast balls offer the simplest path. They contain everything you need in one product.
Step-by-Step Process
Prepare the Rice
Rinse 2 pounds of glutinous rice in several changes of cold water until the water runs mostly clear. Soak the rice for 6 to 12 hours (overnight is fine). Drain it, then steam it. Steaming is better than boiling because it cooks the grains without making them waterlogged. Use a steamer basket or a colander lined with cheesecloth set over a pot of boiling water. Steam for 25 to 40 minutes until the rice is fully cooked through but still has distinct, firm grains.
Spread the steamed rice on a clean baking sheet or large plate and let it cool to body temperature, around 30 to 35°C (85 to 95°F). This step matters. If the rice is too hot, it will kill the mold and yeast in your starter.
Inoculate With the Starter
Crush one Chinese yeast ball into a fine powder. Sprinkle it evenly over the cooled rice and mix thoroughly with clean hands or a sanitized spoon. Transfer the rice into a clean glass jar or ceramic crock. Press the rice down firmly and make a well (a hole) in the center that goes all the way to the bottom. This well lets you monitor liquid accumulation and gives the mold access to air during its initial growth phase.
Cover the container with a loose lid, plastic wrap with a few holes poked in it, or a clean cloth secured with a rubber band. You want some airflow but not full exposure to dust or insects.
Saccharification Phase (Days 1 to 3)
Keep the container in a warm spot, ideally between 25 and 28°C (77 to 82°F). Within 24 to 48 hours, you should see liquid pooling in the well you created. This liquid is the beginning of your rice wine. The rice will smell sweet and slightly yeasty. A bit of white fuzzy mold growth on the surface is normal and expected. Green, black, or pink mold is not. If you see those colors, something contaminated the batch and you should discard it.
Main Fermentation (Days 3 to 21+)
Once liquid has accumulated, you can add water to increase your yield. A common ratio is roughly equal parts water to original uncooked rice by weight (so about 2 cups of cool, clean water for 2 pounds of rice). Stir, seal the container more tightly now, and let the yeast do its work. You’ll see bubbling as carbon dioxide escapes.
Temperature matters during this phase. Research on rice wine fermentation found that starting at 28°C for the first two days maximizes early ethanol production, but dropping to around 23°C afterward produces the highest final alcohol content. In practical terms, a room-temperature environment in the low to mid-70s°F works well. Avoid temperatures above 33°C, which can stress the yeast and produce off-flavors.
Primary fermentation typically runs 2 to 4 weeks. Bubbling will slow and eventually stop as the yeast finishes converting available sugars. The longer you ferment, the drier (less sweet) the final product will be. If you prefer a sweeter rice wine, you can strain it earlier, around day 10 to 14.
Straining and Clarifying
When fermentation is complete, strain the liquid through cheesecloth or a fine mesh bag, squeezing gently to extract as much wine as possible. At this point, your rice wine will be cloudy and milky-looking. This is perfectly drinkable. In Japan, this style is called nigori-zake, and many people prefer it.
If you want a clearer product, you have several options. The simplest is to let the strained wine sit undisturbed in the refrigerator. Cold temperatures cause suspended particles to settle to the bottom. After 48 hours, most of the haze will have dropped out. You can then carefully siphon or pour off the clear wine, leaving the sediment behind. Some home brewers report crystal-clear results after about a week of cold storage without any additives.
For faster results, you can dissolve a small amount of bentonite clay (sold at homebrew shops) in warm water and stir it into your wine before refrigerating. The clay particles attract and pull down suspended solids, visibly clearing the wine within 24 hours.
Pasteurizing and Storing
Unpasteurized rice wine contains live yeast and will continue to ferment slowly, especially if any residual sugar remains. If you bottle it without pasteurizing, pressure can build and bottles can burst. To pasteurize, heat the strained wine gently in a pot to about 65°C (150°F) and hold it there for a few minutes. Do not boil it, as that will cook off alcohol and change the flavor. Let it cool, then bottle in sanitized glass containers.
Pasteurized rice wine stored in sealed bottles in the refrigerator keeps for several months. Some styles improve with aging, developing rounder, more complex flavors over weeks or months.
Safety Considerations
Grain-based fermented beverages like rice wine carry very low methanol risk compared to fruit-based spirits. Methanol is produced primarily from the breakdown of pectin, and rice contains almost no pectin. This makes rice wine one of the safer fermented beverages to produce at home, as long as you stick to fermentation and do not attempt distillation, which concentrates all compounds including any trace amounts of methanol.
The main risks in home rice wine production are contamination with unwanted bacteria or mold. Keep everything that touches your rice and wine scrupulously clean. Use sanitized jars, spoons, and straining equipment. If the fermenting rice smells rotten, vinegary, or develops unusual colored mold, discard the batch. A properly fermenting rice wine smells sweet, yeasty, and mildly alcoholic throughout the process.