Lemon cupcakes with lemon filling

cake 50.8% , fortified wheat flour 24.6% , egg 12.3% , water 6.1% , soya bean 3.1% , canola oil 1.5% , modified corn starch 0.8% , whey powder 0.4% , Raising agent 0.2% , soya lecithin 0.1% , wheat gluten 0.0% , salt 0.0% , DIACETYL TARTARIC ACID ESTERS OF mono- and DIGLYCERIDES 0.0% , artificial flavouring 0.0% , icing 0.0% , fat 0.0% , water 0.0% , lemon peel 0.0% , skimmed milk powder 0.0% , butter 0.0% , invert sugar 0.0% , glucose 0.0% , concentrated lemon juice 0.0% , E471 0.0% , modified corn starch 0.0% , lemon oil 0.0% , salt 0.0% , natural flavouring 0.0% , E102 0.0% , E435 0.0% , filling 0.0% , sugar 0.0% , glucose 0.0% , modified corn starch 0.0% , fortified wheat flour 0.0% , modified palm oil 0.0% , E330 0.0% , salt 0.0% , sodium citrate 0.0% , E415 0.0% , lemon puree 0.0% , E418 0.0% , E211 0.0% , artificial flavouring 0.0% , E171 0.0% , E110 0.0% , E102 0.0% , Crumb 0.0% , E375 0.0% , ferrous sulfate 0.0% , thiamin mononitrate 0.0% , E101 0.0% , folic acid 0.0% , sugar 0.0% , salt 0.0% , yeast 0.0% , canola oil 0.0% , fructose 0.0% , canola oil 0.0% , natural and artificial flavouring 0.0% , spice 0.0%