Put the milk into a saucepan and break the chocolate into pieces and add to the milk along with a cinnamon stick, honey, and sugar. Heat gently until the chocolate is melted.
Add the vanilla and mix with a small hand whisk; still whisking, add a spoonful of the rum first and taste to see if you want more (no point pouring in all at once as it's too late to do anything about it if it's too strong for you) and add more sugar if you want it sweeter. Take out the cinnamon stick and pour into 2 cappuccino or latte cups.
Recipe courtesy of Nigella Lawson(Copyright 2004, Feast, Hyperion, All Rights Reserved)