1.Preheat oven to 180°C. Lightly grease an 18 x 28cm slice pan and line with baking paper, extending over two long sides.
2.Sift flours and cocoa together into a large bowl. Stir in nuts. Make a well in the centre.
3.Place chocolate and butter in a heatproof bowl. Place over a saucepan of simmering water. Stir until mixture is melted and smooth. Remove from heat.
4.Blend sugar, eggs and cream into chocolate mixture. Add to flour mixture. Stir with a wooden spoon until well combined.
5.Pour mixture into pan. Spread evenly. Bake for 25-30 minutes or until cooked when tested with a skewer. Allow to cool in pan.
6.Lift from pan and dust with cocoa powder. Cut into squares to serve. Store in an airtight container.
If you like, make an icing by combining 2 cups icing sugar sifted with 2 tablespoons cocoa. Mix in 30g chopped butter and 1-2 tablespoons hot water. Stir until smooth.Note