Drain the pineapple very well and set it aside for the time being.
Mix the cream with the custard powder until there are no more lumps. Bring the milk with the vanilla sugar to the boil and remove from the stove. Pour the pudding powder mixed with cream into the hot milk and stir in with a whisk. Add the sugar and stir well again. Put the pot back on the stove and let the pudding simmer for 2 minutes.
Dice the pineapple and place on four dessert bowls. Pour the cream over the pineapple and then let it cool. Store in the refrigerator and consume within three days.