Mix the custard powder and cocoa powder with ¼ cup room temperature milk, without any lumps.
Boil 500 ml milk nicely.
Add the custard and cocoa powder mix to this.
Stir well and take care not to get it burnt.
This will get thickened soon, so be careful not to burnt it.
Add sugar to this mixture and stir well.
Switch off the flame.
Dip the marie biscuits in the coffee decoction and arrange this in a big bowl.
Pour the custard mixture on this. You can pour hot mixture to the biscuits.
When it is warm, cover it with an aluminium foil or cling wrap.
Refrigerate for 4-5 hours. Take out and slice it before serving.
Garnish with cashew nuts | almond slices | and choco chips.