Cheese and Onion Sandwich

wheat flour 52.5% , wheat flour 16.5% , E170i 2.0% , iron 2.0% , E375 2.0% , thiamin 2.0% , water 2.0% , cheddar 2.0% , red leicester 1.7% , onion 1.5% , rapeseed oil 1.3% , _Oatmeal_ 1.2% , oat 1.1% , wheat bran 1.0% , corn flour 1.0% , full fat soft cheese 0.9% , white wine vinegar 0.9% , pasteurised egg yolk 0.8% , salt 0.8% , yeast 0.8% , wheat gluten 0.7% , spirit vinegar 0.7% , E471 0.7% , E472e 0.7% , muscovado 0.7% , mustard powder 0.7% , barley malt flour 0.6% , palm oil 0.6% , E300 0.6%