Heat a pan, dry roast the walnuts in a low flame till it gives a nutty smell which is within 5 mins.
Chop the walnuts into small pieces.
The next step would be to butter the cake pan on all sides and keep it aside.
In a pan, add the sugar and cocoa powder. Mix it well using a whisk.
Gradually add water and stir well
Place it over medium heat. Add butter (cut into pieces so it melts quickly) and vanilla extract.
When the butter is melted, add trong brewed coffee to the mixture and keep mixing well for about 5 minutes. Keep it aside and let it cool a bit.
Pour the chocolate syrup over the biscuits and mix well.
Add most of the chopped walnuts (leave some to garnish on the cake) and mix it along with the biscuits and the syrup.
Transfer the mixture into the buttered cake pan.
Press down the biscuit mixture evenly and refrigerate for 30 minutes.
Break the cooking chocolate (I use DARK chocolate ONLY) and keep it aside.
Heat a pan, pour a cup of heavy whipping cream in it.
Add the chocolate pieces.
Stir until smooth.
Looks smooth and silky.
Pour ganache over the chocolate biscuit cake evenly. Remember to lick the leftover sticking to the pan :))
Garnish with toasted chopped walnuts on top and refrigerate for 4 hours for it to set well.
Of course, serve it with whipped cream and enjoy till the very last bite - sharing is optional :)