Prepare a smooth mango puree by blending ripe mango pieces. Strain if needed to remove fibers.
In a saucepan, heat heavy cream, milk, and half the sugar over low heat until warm. Do not boil.
In a bowl, whisk egg yolks with the remaining sugar until pale and smooth.
Slowly pour the warm cream into the egg mixture while whisking gently to combine.
Add mango puree and vanilla extract. Mix until fully smooth and even in color.
Strain the mixture through a fine sieve into a clean bowl to remove lumps and bubbles.
Pour the custard into ramekins and place them in a baking tray. Add hot water around them to form a water bath.
Bake at 160 degrees Celsius for 35 to 40 minutes until the edges are set and the center slightly jiggles.
Remove from oven, cool at room temperature, then refrigerate for at least 4 hours.
Before serving, sprinkle sugar evenly on top and caramelize with a torch until golden and crisp.