Take a skillet, preheat over medium heat and place mung beans, cook until dark brown.
Place on a wide tray, required aluminum or stainless.
Cool and then crush with a glass bottle. Roll the bottle until the mung beans are slightly crushed.
Put 4 cups of water in a casserole, boil and when boiling put the crushed bean. Cook for 20 mins.
Put glutinous rice, mix until boiling and when boiling cover and reduce fire. Cook for another 30 mins. (Every 2 mins mix it)
Put the coconut milk and sugar in the mixture until boiling again. When boiling cook for 5 mins.
Serve while hot.