Put your freezer bowl for your ice cream maker in the freezer the day before.
Add half the sugar, all of the milk and all of the cream to a pot on your stove and cook at low heat until almost boiling.
Add vanilla and cinnamon, set aside.
Add the rest of the sugar and the egg yolks to another bowl and beat until ribbon stages.
Add 125ml of the now cooled milk mixture to the eggs, slowly, while beating as to not scramble the eggs.
Heat back up the rest of the milk mixture, then slowly add that to the egg mixture, while whisking.
Put this custard into the freezer or fridge until cold.
Add the ice cream to your ice cream machine and let it mix until your machine is done.
If you want the ice cream to be thicker, add it to a container and put it in your freezer!