Whip the double cream into soft peaks.
- 1 Heat the milk in a small saucepan, stirring, until it almost comes to the boil and feels hot to the touch.
- 2 Add the chocolate buttons, remove from the heat and stir until the chocolate has melted. Add a dash of whisky, if you like.
- 3 Pour into a mug, then finish with the whipped cream, chocolate shavings and marshmallows.