Place milk, vanilla bean, cinnamon stick and ground cinnamon in a saucepan and
heat to a boil.
While the milk is heating, mix the cornstarch, sugar and salt.
Gradually add the eggs to the dry mixture and mix until smooth.
Slowly add 1/3 of the hot milk while whisking constantly (this is tempering the
eggs). Then, pour the tempered eggs back into the saucepan and return to the heat,
stirring constantly (now with a wooden spoon) until the mixture comes to a boil
Remove the vanilla bean (you can rinse the bean and air dry it then add it to
a canister of sugar to make vanilla sugar) and the cinnamon stick.
Pour into a large shallow bowl and cover the surface with plastic wrap or parchment
to prevent a skin. Cool down a bit before putting in the refrigerator.
Pastry Cream should keep about 4 days in a cold fridge but it's best within 2