Cheddar Caramelized Onio Quice

fortified wheat flour 17.0% , single cream 13.5% , crème fraîche 12.3% , cow's milk 11.8% , onion 10.0% , Pasteurised British Free Range Egg 10.0% , extra mature cheddar 7.0% , red leicester 7.0% , butter 4.6% , vegetable fat 4.0% , Barbers Vintage Cheddar Cheese 4.0% , corn flour 0.0% , chives 0.0% , dijon mustard 0.0% , salt 0.0% , dextrose 0.0% , black pepper 0.0% , wheat flour 0.0% , white pepper 0.0%