Method
1) Beat 250gm unsalted butter and sugar together till fluffy and smooth..
2) Add in eggs slowly one by one.
3) Sieve soft flour and add into the batter. Mix till smooth.
4) Add in vanilla essence making sure batter is smooth.
5) Mix cocoa powder into 125gm melted butter. Mix till the paste is smooth and add it into the batter.
6) Lastly add in chopped walnut.
7) Line bottom of a 25cm X 25 cm (10" x 10") square baking tray with grease proof paper.
8) Pour batter into baking tray and bake in oven at 170C (340F) for 40 to 45 minutes.
Allow to cool before frosting with ganache on top.
Recipe makes 1 X 25cm (10") Square Baking Tray.