Take you time, enjoy the process & you'll be rewarded with the most warming & delicious tipple. - Chop up the dark chocolate into small chunks. - Slowly heat the milk until it starts to bubble. - Reduce the heat to low and gradually add the chocolate and cinnamon. Stir slowly until the chocolate is melted. - Add the cocoa powder and sugar and keep stirring for another minute. - Take it off the heat and stir in your rum. Serve in a big mug and if you're feeling extra indulgent top with marshmallows.