Creating your Mango Sago masterpiece is straightforward if you follow these steps:

1. Rinse the Sago Pearls: Place the sago pearls in a fine-mesh sieve and rinse them under cold water for a few minutes to remove excess starch.
2. Cook the Sago: In a pot, bring 4 cups of water to a boil. Add the rinsed sago pearls and cook for about 15-20 minutes, stirring occasionally. The pearls are ready when they become translucent.
3. Drain and Rinse: Once cooked, drain the pearls and rinse them under cold water again to halt the cooking process. Set aside.
4. Prepare Coconut Milk: In a separate saucepan, heat the coconut milk over medium heat. Add granulated sugar and salt, stirring until the sugar dissolves. Do not boil.
5. Combine Ingredients: Once the coconut mixture is warm, add the cooked sago pearls, mixing well. Cook for an additional 5 minutes to allow the flavors to meld.
6. Cool Down: Remove from heat and let the mixture cool to room temperature.
7. Assemble: In serving bowls or cups, layer the mangoes at the bottom. Pour the sago and coconut mixture over the diced mangoes.
8. Chill: Refrigerate for about 30 minutes for a delightful cold treat.
9. Serve: Before serving, stir the mixture gently. Garnish with fresh mint leaves if desired.

With these detailed steps, you can easily whip up this incredible dessert while impressing your friends and family with your culinary skills!