1. Preheat the oven to 160°C/140°C fan/ gas mark 3. Grease and line 3 x 20-cm/8-inch round cake tins with greaseproof paper.
2. Place the butter and dark chocolate in a heatproof bowl set over a pan of gently simmering water (make sure the base of the bowl does not touch the water). Use a metal spoon to stir, until completely melted. Set aside to cool a little.
3. Sift together the flours, bicarbonate of soda, sugars, and cocoa powder in a large mixing bowl, stir to combine. We used our KitchenAid Colour of the Year 2024 Blue Salt Artisan Stand Mixer.
4. Beat the eggs into the chocolate mixture.
5. Pour the chocolate mixture into the dry mixture and stir until combined.
6. Divide the mixture among the prepared tins.
7. Place on the middle shelf of your hot oven and bake for 50 minutes. Check one by inserting a skewer into the middle of the cake. If baked the skewer will come out clean. If not, pop the cakes back in the oven for 5 minutes more!
8. Allow the cakes to cool in the tins for a few minutes, before turning out onto a wire rack.