Bloom the Gelatin: Mix coconut milk and heavy cream together in a small saucepan. Sprinkle the gelatin on top of the milk mixture and let it bloom for 5 minutes.
Cook until Smooth: Add the sugar and knotted pandan leaves (if using). Turn the heat on to medium-low and stir constantly to help the sugar and gelatin dissolve.1
Chill the Panna Cotta: Remove the pan from the heat, and take the pandan leaves out. Pour the mixture into small cups2 and allow to set in the refrigerator for 30 minutes to 2 hours.3
Top with Mango Puree: Peel and cut a mango into large chunks. Put the chunks into a blender and blend until smooth.4 Top the chilled panna cotta with mango puree, and small cubes of mango if you like.
Notes
1: To help break up clumps, you may want to use the back of your spoon and mush some of the gelatin against the side of the pan while stirring.2: This recipe makes the perfect amount to fill 4 Oui yogurt cups. I'd recommend filling them ¾ of the way, leaving at least ¼ of the cup for the mango puree.3. If you want a more pudding-like consistency, chill for approximately 30 minutes. If you want a firmer texture, allow the panna cotta to chill for at least an hour or two. To unmold the panna cotta, you'll want it to chill for at least 4 hours or up to overnight. 4: If your mango isn't as sweet as you'd like, feel free to add some white granulated sugar to the blended puree until you reach your desired sweetness level.