Salmon En Croute with a Creamy Leek Sauce

pink salmon 26.8% , wheat flour 15.8% , Margarine 15.8% , water 13.6% , Low Fat Quark Soft Cheese 4.8% , leek 3.2% , cream 2.6% , salt 0.6% , modified corn starch 0.6% , parsley 0.6% , whey powder 0.6% , whole milk powder 0.6% , CREAM POWDER 0.6% , sugar 0.6% , natural flavouring 0.6% , rapeseed oil 0.6% , maltodextrin 0.6% , fish 0.6% , potato starch 0.6% , dehydrated onion 0.6% , lemon peel 0.6% , parsley 0.6% , Thickener 0.6% , Flour treatment agent 8.6%