Place a sealed container to cool in the freezer.
Break up the chocolate and place with the milk in a large saucepan over a medium heat. Stir until the chocolate has melted, then carefully remove the saucepan from the heat and leave to cool for a few minutes.
Put the Galbani Mascarpone into a large bowl and add the melted chocolate mixture. Whisk until you get a smooth creamy consistency.
Remove the container from the freezer and pour in the mixture. Seal the container and freeze for at least 2 hours.
After 2 hours, take your mixture out of the freezer. Using a hand blender or whisk stir the cream mixture together to break up the crystals. Seal the container and place your mixture back in the freezer for another 2 hours. Repeat this step every 2 hours until your mixture is thick and smooth. Freeze for at least 6 hours before serving.