Rinse 3 to 4 times in plenty of fresh, clean water. Drain.
Cover with freshly filtered water and soak for 9 to 12 hours. For best results, use boiled/dechlorinated water cooled to room temperature.
If soaking lasts longer than 9 hours, discard the water and refill with fresh water. This helps prevent the bean sprouts from developing a musty smell.
When you are ready to sprout the mung beans, discard the soaking water. Rinse at least 3 times with clean water. Drain in a colander.
Transfer the soaked, drained mung beans to a jar or container. Make sure there is no water left; you don't want them to mold.
Cover loosely with a lid or cloth.
Place the bowl/jar in a warm, dark spot away from sunlight.
Leave undisturbed until the beans sprout. Sprouting time depends on temperature; some mung beans sprout in a few hours, while others take up to a day or two.
After 12 hours, check if they have sprouted. If you prefer longer sprouts, sprinkle with clean water and let all excess water drain from the batch or the jar/bowl. Excess moisture can cause them to rot.
Refrigerate the mung bean sprouts in a clean, dry, airtight jar and use within 2 to 4 days.
Notes
Use liberally to top all your favorite Asian dishes!Within 24 hours, the mung beans should begin to sprout; if not, they were likely not viable.