Preheat the oven to 480F/250C.
Remove from heat and pour all the flour at once. Mix with a spatula, making sure not to leave any lumps. The result is called a panade.
Desiccate the panade over medium heat, stirring with the spatula, until it comes off the sides of the pan and forms a ball.
Bake these rings in the oven and immediately decrease the temperature to 350F/175C.
Cut the vanilla pod lengthwise and scrape the vanilla seeds.
Pour the milk in a large nonstick saucepan. Add the sugar, the pudding powder, split vanilla pod and vanilla seeds. Bring to a boil, stirring regularly.
Remove the vanilla pod, and whisk. Cook for one minute, stirring constantly.