- Bring a pot of water to a boil, then add the mini tapioca pearls. Stir to prevent sticking. 
- Cook for 15 minutes or until the pearls are mostly translucent with a small white center. 
- Turn off the heat, cover the pot, and let the pearls sit for 10 minutes to finish cooking. 
- Drain and rinse the pearls under cold water. Set them aside. 
- Blend one and a half mangoes with milk and condensed milk until smooth. 
- Dice the remaining half mango for topping. 
- In a mixing bowl, combine the mango milk mixture with the cooked sago pearls. Stir gently. 
- Chill for at least 30 minutes, then divide into bowls or jars. Top with diced mango and serve.