Wash fresh mung beans for sprouting eliminating any husks, dirt or litter. Throw out any beans that float, as they won't sprout. Put the beans in a bowl of warm water and let them soak overnight. This soaking softens the outer husk for easier sprouting.
Collect the beans and transfer them into a jar for sprouting. Sprinkle 1 to 2 teaspoons of water over the beans, cover the jar with cheesecloth and put them in a dark, warm place for sprouting. Don't fill the jar with water, as they rot instead of sprout. Keep the beans at 70 to 80 degrees Fahrenheit for best sprouting.
Sprinkle the beans with more water two to three times every day and tilt the jar after watering to keep them evenly moist. Expect sprouting in three to seven days.
Collect the beans after sprouting and rinse them again. Remove the husks and any beans that failed to sprout. Cut the sprouts from their beans with a sharp knife.