Method:
- Pre-heat oven to gas mark 4/180°C/170°C fan/375°F. Line a 24cm/10in deep cake tin with baking parchment.
- Whisk the eggs and sugar together in a basin set over a pan of hot water until mixture is light and fluffy and leaves a thick ribbon trail.
- Put grated chocolate and hazelnuts into a bowl and add the melted butter, baking powder and orange zest. Combine well.
- Gently fold in the whisked eggs and sugar to the chocolate mix until just incorporated. Spoon carefully into the prepared tin. Bake on the middle shelf of pre-heated oven for 20 mins, then scrunch up some baking parchment and hold under running tap, squeeze out and place on top of cake.
- Continue baking for further 20-25 mins or until cake pulls away from tin and top springs back when lightly pressed.
- When cake is done, stand tin on wire cooling rack for 15-20 mins. Turn cake out and cool. Dust with cocoa powder and serve.
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