Square chocolate cake

icing sugar 51.4% , sugar 24.3% , fortified wheat flour 12.2% , egg 6.1% , water 3.0% , cocoa processed with alkali 1.5% , soya oil 0.8% , palm oil 0.4% , invert sugar 0.2% , canola oil 0.1% , E422 0.0% , egg white 0.0% , E471 0.0% , propylene glycol mono- and diesters of fatty acids 0.0% , Modified starch 0.0% , Raising agent 0.0% , semi-sweet chocolate 0.0% , dextrose 0.0% , salt 0.0% , whey 0.0% , soya flour 0.0% , potassium sorbate and sodium propionate and sorbic acid 0.0% , soya lecithin 0.0% , sweetened condensed skimmed milk 0.0% , corn flour 0.0% , E435 0.0% , skimmed milk 0.0% , E415 0.0% , E412 0.0% , E466 0.0% , E490 0.0% , E433 0.0% , natural and artificial flavouring 0.0% , corn starch 0.0% , E330 0.0% , E334 0.0% , cocoa paste 0.0%