1. Bloom the gelatin: In a small bowl, mix the gelatin powder with water and let it sit for 5 minutes.
2. Heat the mixture: In a saucepan, combine the coconut milk, heavy cream, and sugar. Heat over medium heat until the sugar dissolves and the mixture is hot but not boiling.
3. Add gelatin: Remove the saucepan from heat and stir in the bloomed gelatin until fully dissolved. Add the vanilla extract.
4. Combine with mango puree: Let the mixture cool slightly, then stir in the mango puree.
5. Pour into glasses: Pour the mixture into serving glasses and refrigerate for at least 4 hours or until set.
6. Serve: Garnish with fresh mango slices or mint leaves before serving, if desired.