Line a baking tray with baking parchment (or grease and flour it).
Place the dark chocolate in a bowl on top of a pan of simmering water until melted. Remove from heat.
Beat the eggs and sugar together in the mixer until pale and fluffy.
Slowly add in the melted butter until well mixed in.
Gently mix in the flour and cocoa until all incorporated.
Add and mix in the melted dark chocolate, do not overmix.
Add the white chocolate chunks and toasted hazelnuts and gently mix in.
Spoon into prepared tin and bake for 20 mins. Remove from oven and let cool completely before cutting.
Published: Photographs:David Merewether Recipes:Lucinda Hamilton Recipes Type:Special Occasions
Cocolicious, Lucinda Hamilton's catering company, creates sweet bites and savoury delights for any occasion – from bespoke cakes to afternoon teas and dinner parties. For more information, visit the Cocolicious Facebook page or email firstname.lastname@example.org