Now take 500 ml of milk and from it keep 1/4 cup of milk a side.Now take a bowl and take 3 tsp Cornflour and 3 tsp of coco powder and mix well,and then add 1/4 cup of cold milk in it and mix well so that no lums form in it.Boil the remaining milk in gas and add 1/3 cup of sugar and mix it.