In a pan take 4 cup of full fat milk, heat milk & let it come to a boil..

Once the milk start boiling add sugar & keep stirring constantly till the sugar dissolves...

Now take a small bowl & add custard powder, Cocoa powder & milk.. give it good mix...Make sure there is no lumps in a milk..

Now pour this into the hot milk..keep stirring because of milk is going to start thikning up as milk comes to the boil again, keep stirring & let it cook for another 2 min..

Now let it cool down for 10 min.. Then pour in a cup & refrigerate for 2 hours..