Finely grate or chop the chocolate. Add the spices and alcohol to the milk and bring to the boil while stirring. Remove from fire and stir in chocolate, cocoa powder and brown sugar. Let it steep until the desired taste intensity is reached (takes about 5-10 minutes). Then, as desired, first beat cold on ice water or pass hot immediately and serve.
Tip: The alcohol can also be added after letting it steep. Then you can taste it more intensely.