In a small cup, mix the vanilla pudding with 50 ml (1/4 cup) of coconut milk.
Put 250 g (1 cup) of coconut milk in a pot, add coconut sugar and cocoa powder, mix and bring to a boil. When it boils, pour in the previously prepared pudding mixture while stirring continuously.
Cook on moderate heat for another 3 minutes, stirring several times.
Pour over the crust and leave to cool down.
Decorate if desired and cut into 9 slices.