Put 800ml whole milk in a pan and add a few strips of orange peel. Heat to just before boiling and then keep at that temperature. Chop up 100g very dark chocolate and 100g milk chocolate. Remove milk from heat and take out the peel. Add the chocolate and stir until silky smooth. Stir in about 4 tbsp of thick double cream.
Pour into four small mugs and scatter over some mini marshmallows. Then grate over some chocolate (the one below was without the extra grated chocolate!)