In a saucepan bring milk to boil and add sugar in it.In a separate bowl add cold milk 1/2 glass and add the custard powder.mix well and slowly add the mixture into the milk.keep whisking quickly into the milk to avoid lumps.

Keep the flame on medium low and let it cook for 5 to 10 mins or atleast until bubbles appear and milk starts to thicken.in case it doesnt get thick make another cold mixture of 1 tbsp custard powder and little by little till desired thickness appears.

Meanwhile in another saucepan take 2 medium cups of water and bring to boil.add the jelly powder and whisk properly.let boil till bubbles appear and it thickens a little.

In an ice cube container add the jelly and freeze until stiffens. In serving bowls add the custard and layer with cake slices if you like and let cool in the refrigerator.then top with jelly cubes, mango chunks and coconut ice cream.