01 -
Melt the dark chocolate in a heatproof bowl over simmering water.
02 -
Whisk egg yolks and sugar until thick and pale, then fold in the melted chocolate and hazelnuts.
03 -
In a separate bowl, beat egg whites until stiff peaks form, then gently fold into the chocolate mixture.
04 -
Pour into a greased cake pan and bake at 180°C for 25-30 minutes.
05 -
Whip the cream with hazelnut liqueur until soft peaks form, then spread over the cooled cake.