Lasagnes façon bolognaise

semi-skimmed milk 53.5% , pork 23.0% , water 8.2% , durum wheat semolina 5.0% , cheese 3.4% , tomato concentrate 2.5% , tomato 1.9% , wheat flour 1.5% , vegetable fat 1.2% , vegetable oil 1.0% , onion 0.9% , modified corn starch 0.7% , egg 0.6% , salt 0.6% , potato starch 0.5% , spice 0.4% , herb 0.4% , natural flavouring 0.3%