Boil tapioca pearls – Bring 5 cups (1.25 liter) water to a boil in a deep pot and add small tapioca pearls. Cook uncovered for 15 minutes, stirring occasionally to prevent sticking. After 15 minutes, the tapioca pearls will turn from white to mostly translucent. Turn off the heat and cover the pot. Allow to sit for another 15 minutes until the pearls are fully translucent. If the center of the tapioca pearls is still white and not translucent, cover the pot and let them sit in the pot for another few minutes.
Rinse – Transfer tapioca pearls in a fine mesh strainer. Rinse with cold water to stop them from cooking and get rid of excess starch.
Mix tapioca pearls and coconut milk in a large bowl.
Peel and cut the mangos into cubes. Discard the center pit. Set aside a handful of nice chunks for the topping. The rest will be blended.
Blend the mangos – In a blender, add the mangos and sweetened condensed milk. Blend until smooth. Taste for sweetness. Add more condensed milk as needed.
Divide the mango mixture into 6 glasses. Then pour the sago mixture on top of the mango layer. Top with cubed mangos. You can also mix everything in a large bowl and serve. Mango Sago is best served chilled.
Notes
How to make vegan mango sago – You can make this recipe vegan by omitting the condensed milk and adding granulated sugar, brown sugar, honey, or other sweeteners to taste.