Cheese and Onion Quiche

fortified wheat flour 41.4% , skimmed milk 16.8% , egg 10.5% , onion 11.0% , mature cheddar 3.8% , water 2.9% , vegetable oil 2.6% , red leicester 1.9% , double cream 1.6% , Fromage Frais 1.4% , corn flour 1.2% , mild cheddar 1.1% , modified corn starch 1.0% , dextrose 0.9% , white pepper 0.9% , nutmeg 0.8% , cereals containing gluten 0.7%