Sweet Mung Bean and Sago Soup

mung beans ((rinsed and soaked for at least 2 hours, drained) (220g))

brown sugar (** (135g))

water ((1.5liters))

pandan leaves ((rinsed and knotted))

sago (/ tapioca pearls, soaked for 10 minutes, rinsed and drained (40g))

coconut milk ((240ml))