½ orange, finely grated zest only
fresh orange zest, to decorate (optional)
½ tsp baking powder
100²µ/3½´Ç³ú caster sugar
40²µ/1½´Ç³ú cocoa powder, sifted
100²µ/3½´Ç³ú orange-flavoured milk chocolate, from a ball or bar, broken into pieces
100²µ/3½´Ç³ú self-raising flour
sunflower or vegetable oil, for greasing
100²µ/3½´Ç³ú softened butter, cubed
2 medium eggs
cream, ice cream or custard, to serve