Cook the rice for 1-2 minutes, and drain away all the water.
In a casserole pour the milk, butter, sugar and vanilla sugar. Heat it up until the butter is melted.
Add the rice and let it boil on very low heat for 30 minutes.
Mix the flour with 4 tablespoons of milk and the cinnamon, and add it in the rice. Let it all boil 2 more minutes.
Take away the casserole from the stow and place the rice in small portion bowls and let it rest.