Steak Burger Wirh Caramelised Onions

beef 60.0% , BEEF CHUCK 21.0% , caramelised red onion relish 12.0% , rice flour 3.6% , muscovado 1.7% , demerara sugar 0.8% , salt 0.4% , onion 0.2% , water 0.1% , glucose syrup 0.1% , yeast extract 0.0% , garlic 0.0% , dextrose 0.0% , bamboo fibre 0.0% , Preservative 0.0% , ginger 0.0% , nutmeg 0.0% , black pepper 0.0% , flavouring 0.0% , green tea extract 0.0% , antioxidant ener 0.0% , rapeseed oil 0.0% , allspice 0.0% , maltodextrin 0.0% , clove 0.0% , allergy advice for 0.0% , gri ene fat 0.0%