In a pot, bring 4 cups of water to a boil. Add the soaked sago pearls and cook for about 30 minutes, stirring occasionally until translucent.

Once cooked, drain the sago using a strainer and rinse under cold water to stop the cooking process.

In a blender, combine the diced mangoes and half of the coconut milk. Blend until smooth.

In a mixing bowl, combine the blended mango mixture, remaining coconut milk, and sugar. Stir until the sugar is dissolved.

Add the cooked sago pearls to the mango mixture and stir well to combine.

Serve in individual bowls, garnished with additional mango pieces if desired.