Ingredients
Icing
Method
1.Preheat oven to moderate, 180°C. Lightly grease an 18 x 28cm slice pan.
2.Sift flours and cocoa into a large bowl. Stir in nuts. Make a well in the centre of the mixture.
3.Combine dark chocolate and butter in a heatproof bowl. Place over a saucepan of simmering water. Stir until mixture melts and is smooth. Remove from heat. Stir in sugar, white chocolate, eggs and sour cream.
4.With a wooden spoon, stir chocolate mixture into flour until well combined.
5.Pour mixture into prepared pan. Spread evenly. Bake for 25-30 minutes, or until cooked when tested with a skewer. Allow to cool in pan.
6.ICING: Sift icing sugar and cocoa together into a bowl. Add butter and water and beat until smooth, adding a little more water as required. Spread over slice and decorate with extra chopped nuts. Cut into squares to serve. Store in an airtight container or freeze.
MAKES ABOUT 32
Note