Time: 1 hour (plus soaking time)Servings: 4-62 cups glutinous (sweet) rice1 13.5-ounce can unsweetened coconut milk, well-stirred1/3 cup sugar1/2 teaspoon kosher salt1 tablespoon sesame seeds, roasted4 small mangos, peeled, pitted, and cut into 1/2″ cubes (The smaller Ataulfos or Manila mangos are sweeter than the larger Tommy Atkins mangos, and are worth seeking out at Asian supermarkets or well-stocked grocery/specialty stores.)cheesecloth for steaming (optional)Rinse the rice in a bowl, using a few changes of cold water until the water is clear. Cover the rice in cold water and let soak at least 1 hour, but preferably overnight.Drain the rice. Pour 1 cup of water into a saucepan. Add rice to a steamer insert (lined with cheesecloth, if using,) and place inside the saucepan. Cover tightly and steam over low to medium heat for 20-30 minutes, or until the rice is tender and shiny. (Add extra water to the saucepan, if it seems like you need extra time.)While rice is cooking, in a saucepan bring coconut milk to a boil with sugar and salt, stirring until sugar is dissolved, and remove from heat. Keep mixture warm.Transfer hot cooked rice to a bowl and stir in coconut-milk mixture. Let rice stand, covered, 30 minutes, or until coconut-milk mixture is absorbed. Rice may be prepared up to this point 2 hours ahead and kept covered at room temperature.
To serve, spoon sticky rice on dessert plates. Top with cubed mango, and sprinkle with sesame seeds.