Drain the soaked glutinous rice and place it in a steamer lined with cheesecloth. Steam for about 20-25 minutes until tender.

In a saucepan, combine coconut milk, sugar, and salt. Heat over medium heat until sugar dissolves, but do not boil.

Once the rice is cooked, transfer it to a mixing bowl and add half of the coconut sauce. Mix well and let it sit for 10 minutes.

To serve, place a portion of sticky rice on a plate, top with sliced mango, and drizzle with the remaining coconut sauce.