Cut the vanilla pod in half.
Cook the milk and the split vanilla pod over medium heat. Leave to infuse for 10 minutes before you take the vanilla pod out.
While the milk is simmering, whisk together the egg yolks, the sugar and the cornmeal.
Now bring the vanilla milk to the boil again and add a third to the egg, sugar, cornmeal mix. (To get a better result pour the milk through a sieve.)
Then add the rest of the milk to the mix. After this, put the whole back into the sauce pan and cook on a high heat.
Whisk continuously and as soon as the milk-mix gets thick take the sauce pan off the hotplate.
Pour the hot pastry cream on cling-film and wrap it carefully, then put it into the fridge.