Prepare fresh cream by adding 4 tablespoons sugar and 1 tablespoon cocoa powder (or as required) and whip it.
Crush walnuts and roast them for garnishing.
Warm a cup of milk and add coffee in it and mix it (add sugar to taste/if needed)
Start layering now. Take a Pyrex dish, dip biscuits in warm milk and start placing them at the bottom of the dish, after completing one layer, add a layer of whipped cream. Two layers would be enough. Top it with roasted walnuts and your cold cake is ready!