Prepare ganache by heating cream till bubbles arrive.

Now pour dark chocolate over it.

Swtich off gas, add butter.

Let it sit till chocolate melts.

Give it a good stir and your ganache is ready

Let it cool a little and assemble.

Line a cake tin with parchment.

Spread late today biscuits and pour ganache over it.

Spread walnuts and biscuits and again a top layer of ganache.

Decorate with walnuts.