Wash the mung beans 8 to 10 times, or until the water is clear. Soak for a minimum of 4 hours to overnight, with a ratio of 3:1 of water and mung beans.
Wash the mung beans another 4-5 times. Drain all the water and leave it in a strainer.
Prepare a steamer of boiling water.
When the water is boiling, layer the steamer with muslin cloth before adding all the mung beans. Spread them out evenly, with a hole in the centre. Steam for 20 minutes.
Switch off the heat. Remove the steamer. Spread the mung beans to air for 3 to 5 minutes.
Prepare a large frying pan with cooking oil. Switch on the heat to medium. Let the oil heat up for 10 minutes, or until air bubbles form at the tip of dipped wooden cooking chopsticks.
Add 1/4 of the mung beans to the oil batch by batch with a spatula. Fry for 2 minutes, stirring often.
Remove from the pan and place on a strainer with a tray at the bottom. Fry the remaining mung beans.
Give the strainer a little shake to remove excess oil. Optionally, sprinkle salt over the mung beans. With a spatula, stir the mung beans until the salt is evenly distributed.
Layer a tray with oil-absorbent paper. Spread the mung beans on the tray evenly to cool.
Once cooled, it can be enjoyed with Mango Sticky Rice or ice-cream.
Store the extra in an air-tight container at room temperature.