In a small bowl, sprinkle gelatin over cold water and let it sit for 5 minutes to bloom.
In a saucepan, heat coconut milk, heavy cream, and sugar over medium heat until warm but not boiling.
Remove from heat, stir in vanilla, and add the bloomed gelatin. Stir until completely dissolved.
Pour mixture into serving glasses, filling each halfway. Refrigerate for at least 2 hours until set.
Top with mango puree and chill for another hour.
Garnish with mint leaves or mango chunks if you’re feeling fancy.