Bring a pot of water to a rolling boil before adding the sago pearls. Stir immediately to prevent sticking and cook until the centers turn translucent. Once done, drain and rinse under cold water to stop further cooking.
Peel and dice the mangoes, then blend them until completely smooth. I like to reserve a small portion of diced mango for garnish and texture. Fresh mango puree gives the dessert its vibrant color and aroma.
In a bowl, combine coconut milk, evaporated milk, and sugar until fully dissolved. Add the mango puree gradually and stir until smooth and creamy. Taste and adjust sweetness if needed.
Add the cooled sago pearls to the mango mixture and gently stir. Make sure the pearls are evenly distributed so every spoonful has a bit of everything. The mixture should look silky and slightly thick.
Cover the bowl and refrigerate for at least one hour. Chilling allows the flavors to blend beautifully and improves the texture. Serve cold with extra mango pieces on top.