Melt chocolate in a saucepan over low heat (about three minutes). Keep an eye on the chocolate to prevent burning.
Once most of the chocolate is melted, add in heavy cream and stir until incorporated.
Add cocoa powder and sugar and stir vigorously to get rid of any lumps. Cook mixture for two minutes or so, allowing it to thicken. Mixture should be steaming and perhaps bubbling but not boiling.
Add red wine to saucepan and continue cooking for no more than another minute, stirring continuously. Do not bring to a boil. Remove from heat and serve warm.
Notes
StorageAllow the hot cocoa to cool to room temperature and transfer to an airtight container. Store in the fridge for up to five days.