In a small bowl, mix the milk, cocoa powder and instant coffee( optional). Stir until completely dissolved in milk.

In a pot, over medium heat, put the milk, cocoa and instant coffee mixture and wait just until it gets hot. This will only take a minute. Add the honey and the butter and stir until they are completely dissolved

Remove from heat., add the grated chocolate and stir continuously until you have a thick and smooth sauce. Serve.