Boil Sago: Bring 3 cups of water to a boil. Add the sago pearls and cook for 10-12 minutes until they become transparent.
Rinse: Drain the cooked sago and immediately rinse under cold tap water to remove excess starch. Set aside.
Thicken Milk: In a separate pan, boil the milk with sugar for 5 minutes until it reduces slightly. Let it cool to room temperature.
Combine: Mix the cooled milk, mango pulp, and the cooked sago pearls in a large bowl. Stir well to combine.
Serve: Pour into serving glasses. Top with fresh mango chunks and a few mint leaves or nuts for garnish. Best served chilled.