Combine 1/2 cup mung beans and 1 cup warm water, or approximately 75 degrees Fahrenheit, in a sprouting jar. Use organic dried beans for best results.
Secure the jar's lid and place it into a dark cupboard for 10 to 12 hours.
Drain the water from the sprouting jar. The mungs should look plump from the water they have absorbed.
Fill the jar with cool water and swirl the beans around. Drain off the water and repeat until it rinses clear. Place the lid back onto the jar and set the well-drained mungs back into the cupboard.
Rinse the sprouts in cool water twice daily, placing them back into the cupboard each time. Continue rinsing the beans twice daily for five days, or until the bean sprouts are the same thickness as the beans.
Pour the bean sprouts into a mixing bowl and remove any hard beans that did not grow. These are painful to bite down on if you accidentally place them into a dish.
Cover the mixing bowl with plastic wrap and keep in the refrigerator for up to five days.