Soak the mung beans in water for 3 hours.
Dampen a cheesecloth, spread the soaked mung beans on it, and place it in a steaming pot over boiling water.
Wrap the cheesecloth up and steam on medium heat for 20–30 minutes, until the beans are soft. Let them cool afterward. Continue with the next step while it’s steaming.
For the pudding, heat a pot with 34 fl oz of water, sugar, and pandan leaves on medium. Cook until the sugar is dissolved.
In a separate bowl, mix 16 fl oz of water with tapioca starch. Whisk it in gradually.
Stir this mixture into the pot with boiling water. Keep stirring until it thickens and becomes clear.
Gently stir in the cooled mung beans and then turn off the heat.
In a saucepan, combine coconut milk, rice flour, and salt. Heat it up on low-medium, stirring until it slightly thickens, then take it off the heat.
To serve, put the pudding in bowls and drizzle with the coconut milk sauce. Enjoy!