Dry roast the walnuts and keep aside.
Now break the biscuits into small pieces.
Mix biscuits and 100 gms walnuts in a big pan.
Now take another pan and water sugar and cocoa powder mix well and give 1 boil.
Now add butter keep stirring and let it boil on low flame for 5 mins. Off the flame and let it cool a bit .
Now add the vanilla essence and pour the mixture on biscuits and mix it well.
Put the biscuits mixture in a setting bowl and keep in fridge for 1/2 hour.
Now take another pan and put cream and boil it . Givd only 1 boil off the flame add the dark chocolate pieces and keep stirring for a mins till chocolate melts completely.
Now remove the cake from the fridge pour the chocolate mixture and spread evenly.
Now again keep the cake in fridge for 4_5 hours.
Now use the remaining walnuts for toppings.
Cut the cake into desired shape as per your choice
