Step 1: Soak the Sticky Rice

1. Rinse the Rice: Begin by rinsing the sticky rice thoroughly under cold water. This removes excess starch and helps the rice cook properly.
2. Soak the Rice: Place the rice in a bowl and cover it with water. Let it soak for about 30 minutes. This step is essential for achieving the sticky texture.

Step 2: Steam the Rice

1. Prepare the Steamer: While the rice soaks, prepare a steamer. You can use a traditional bamboo steamer or a metal one. Bring water to a boil in the bottom part of the steamer.
2. Steam the Rice: Once soaked, drain the rice and transfer it to the steamer basket. Cover and steam for about 20-25 minutes, or until the rice is tender but still firm to the bite.

Step 3: Make the Coconut Sauce

1. Combine Coconut Milk and Sugar: In a small saucepan, combine the coconut milk, sugar, and a pinch of salt (optional). Heat over medium heat, stirring until the sugar is dissolved. Do not bring it to a boil; you just want to warm it up.
2. Pour Over Rice: Once the rice is cooked, transfer it to a large bowl and pour the coconut sauce over the warm rice. Stir gently to combine, ensuring the rice absorbs the coconut flavor. Let it rest for 10-15 minutes so the flavors meld together.

Step 4: Prepare the Mangoes

1. Peel and Slice the Mangoes: Peel the mangoes carefully, then slice them into thin, even slices. You can do this by cutting along both sides of the pit and then slicing the flesh into thin strips. Arrange the slices on top of the coconut sticky rice.

Step 5: Assemble and Serve

1. Plate the Sticky Rice: Spoon the sticky rice onto serving plates. Make sure to mound it a bit, as this gives it a nice presentation.
2. Top with Mango: Arrange the mango slices on top of the rice, fanning them out beautifully.
3. Finish with Coconut Sauce: Drizzle a bit more coconut sauce over the top of the rice for extra creaminess.
4. Optional Garnishes: Sprinkle with sesame seeds, mung beans, or a mint leaf for a touch of elegance.