Melt the chocolate with the butter and zest over ... then cut it to whatever size squares you would like. Line a 9inch square cake tin and heat the oven to 180°C. To make the shortbread combine ...
Leave to cool, then put the chocolate mixture in the fridge for 1-2 hours to set. Turn out the cake and peel off the cling film. Cut the cake into 12 squares and enjoy! Marshmallows, honeycomb and ...