150 g butter, cubed
165 g [3/4 cup] sugar
3 eggs, at room temperature, lightly whisked
2 tbsp unsweetened cocoa powder
150 g walnuts
Grease a 16 cm x 26 cm shallow slice tin.
Place the chocolate and butter in a medium heatproof bowl over a saucepan of simmering water, making sure the base of the bowl doesn’t touch the water. Stir occasionally until the chocolate and butter have melted and the mixture is smooth.
Remove the bowl from the saucepan. Add the sugar and eggs to the chocolate mixture and use a whisk to stir until well combined.
Sift together the flour and cocoa powder. Add to the chocolate mixture and stir until just combined. Stir in the walnuts.
Pour the mixture into the prepared tin and spread evenly. Bake in the preheated oven for 35–40 minute.
