Take all the ingredients. In a small bowl take few amount of milk and mix cocoa,corn flour in it.

In a hot pan add rest of the milk and start boiling. Once it boils add sugar as per your taste.

Then add cocoa,corn flour and milk mixture.

Then add grated chocolate. Mix it well.

Turn off the stove and filter. Drink if you want to it hot. Now keep it in refrigerator for 30mts and ice cubes and serve cool.