makes 9

4 oz butter, plus extra for greasing

8 oz white chocolate

2/3 cup walnut pieces

2 eggs

1 cup brown sugar

1 cup self-rising flour

Preheat the oven to 350F. Lightly grease a 7 inch square cake pan.

Coarsely chop 6 oz of the chocolate and all the walnuts. Put the remaining chocolate and the butter in a heatproof bowl, set over a pan of gently simmering water.

When melted, stir together, then set aside to cool slightly.

Whisk the eggs and sugar together, then beat in the cooled chocolate mixture until well mixed. Fold in the flour, chopped chocolate, and the walnuts. Turn the mixture into the prepared pan and smooth the surface.

Transfer the pan to the preheated oven and bake the brownies for about 30 minutes, until just set. The mixture should still be a little soft in the center. Let cool in the pan, then cut into 9 squares before serving.