Melt the chocolate and Butter in a water bath.
Whisk the egg yolks with the sugar, add the milk and melted chocolate.
Mix it thoroughly with the ground cinnamon and vanilla pod.
Pour it into the mould and steam bake at 120°C for 1.5 hours.
Remove from the mould and let it cool at room temperature.
Then, put it in the fridge.
Finally, blend until smooth, strain, pour into a silicone mould and put it in the freezer.