Heat the coconut milk and sugar in a pot. Bring it to boil and turn off the heat. Let it sit there.
Put another pot with 500ml of water on a high flame. When it starts to boil add the tapioca pearls. Stir it very often and cook until they are transparent.
Strain them and wash them very well with cold water. Then add the tapioca pearl to the coconut milk which we prepared previously. Stir all together very gently.
When it gets room temperature, refrigerate until it's cold.
Take two serving glasses and pour cold tapioca. Add freshly peeled and diced ripe mango on top of it and enjoy this wonderful dessert.