150g unsalted butter, chopped

300g dark chocolate, half finely

chopped and half roughly chopped

4 eggs

330g brown sugar

1 tsp vanilla extract

1 tsp orange oil

150g (1 cup) self raising flour

100g milk chocolate, chopped

100g white chocolate, chopped

1.  Preheat oven to 180C. Grease and line a 20cm x 30cm slice

2.  Place butter, finely chopped dark chocolate and 2 tablespoons of water in a small pan, stir over low heat for 3 minutes or until melted, then transfer to a bowl

3.  Whisk in eggs, sugar, vanilla and orange oil.

4.  Sift in flour, then fold in the remaining chopped chocolates.

5.  Spoon batter into pan and then bake for 35 minutes or until firm around the edges but soft in the centre.

6.  Cool for 10 minutes, then refrigerate for 2 hours or until chilled.