Add all the ingredients to a bowl (leave the melted dark chocolate out for now).

Mix until everything is well incorporated.

Transfer into a tin (I have put a piece of baking paper at the bottom to make it easier to remove).

Press down with your hands or the bottom of a glass.

Pour the melted dark chocolate to completely cover the top.

Put in the freezer for 1 hour so it becomes solid.

Cut into square and eat straight from the freezer