Preparing The Green Moong Beans: Pour 3 to 4 cups of water in a cooking pot, without turning on the heat at this moment. Put the green mung beans in the water, remember that the green moong beans used in the luk chup recipe are those without the green skin. We will call them green mung beans even though, the skin has been peeled off when you bought them at the gocery store. Let the moong beans soak in the water for 6 to 7 hours. At this point, take off the excess water and let the peeled green mung beans remain. You will then need to steam the green mung beans until they become soft. Make sure that you have drained off all the water from the beans before starting the steaming process. Once steamed, leave the beans aside to cool down.