Rinse the rice thoroughly under cold water until the water runs clear to remove excess starch. This is essential for a clean fermentation.
Soak the rinsed rice in enough water to cover it by at least an inch for 4-5 hours, or overnight. This helps the grains absorb water, preparing them for cooking and fermentation.
Drain the rice and steam it on high heat for 30-40 minutes until fully cooked and tender. Let it cool to room temperature before the next steps, as warm rice can adversely affect the yeast.
While the rice cooks, sterilize your fermenting jar, mixing bowl, and utensils. Boil them for 10 minutes or use a dishwasher's sanitizing cycle to prevent bacterial contamination. I can't stress enough the importance of sterilization.
In the sterilized mixing bowl, mix the cooked rice with the crushed yeast ball and cooled boiled water. Ensure the grains are well-separated and coated with the yeast.
Move the mixture to the sterilized fermenting jar fitted with an airlock. This setup lets fermentation gases escape while blocking contaminants.
Keep the jar in a warm place, between 86ºF and 95ºF (30ºC to 35ºC), for 7-14 days. Watch for the rice becoming wet, almost liquid-like, indicating fermentation success.
After fermentation, strain the mixture through a fine mesh strainer or cheesecloth to remove any sediments. This clarifies the rice wine, enhancing its quality and taste.
Stir the clarified wine and refrigerate. It can be stored for up to a month. Serve chilled for the best flavor.