01 - Rinse glutinous rice under cold running water until the water runs clear. Soak the rice fully submerged in water for at least 4 hours or overnight.
02 - Drain the soaked rice. Set a steamer basket lined with cheesecloth over simmering water. Steam the rice covered for 25 to 30 minutes, or until grains are tender and sticky.
03 - In a small saucepan, combine coconut milk, granulated sugar, and salt. Warm over medium-low heat while stirring continuously until the sugar dissolves. Do not bring to a boil.
04 - Measure and set aside 1/4 cup of the warm coconut sauce for drizzling during assembly.
05 - Transfer steamed sticky rice to a mixing bowl. Pour the remaining coconut sauce over the hot rice. Mix gently to incorporate, then cover and allow to sit for 15 minutes for absorption.
06 - Portion the coconut sticky rice evenly among small dessert cups or bowls. Arrange sliced mango on top of each serving.
07 - Drizzle each portion with reserved coconut sauce. Garnish with toasted sesame seeds or mung beans and fresh mint leaves, if desired. Serve warm or at ambient temperature.