Cook the sago pearls. Bring a pot of water to a boil, add the sago pearls, and cook until mostly translucent, on low medium heat. Stir often so they don’t stick together. Drain and rinse under cold water.
Blend the mango base. Add about half of the fresh mango cubes to a blender with the light coconut milk and condensed milk. Blend until smooth and creamy.
Assemble. In a large bowl, combine the mango-coconut base, cooked sago pearls, remaining fresh mango cubes, Asian jelly, coconut jelly, and ice cubes.
Mix and chill. Stir everything together and serve cold. Add more coconut milk if you want it thinner, or more condensed milk if you like it sweeter.
