Caramelised Onion Beef Burger

beef 51.6% , red onion 24.2% , water 12.1% , red onion 6.1% , sea salt 0.4% , vinegar 0.4% , onion 0.4% , dehydrated onion 0.4% , salt 0.4% , rapeseed oil 0.4% , sea salt 0.4% , vinegar 0.4% , chives 0.4% , black pepper 0.4% , spirit vinegar 0.4% , tapioca 0.4% , potato starch 0.4% , spice 0.4% , cane sugar molasses 0.2% , salt 0.1% , yeast extract 0.0% , dextrose 0.0% , yeast 0.0% , corn flour 0.0% , garlic 0.0% , Preservative 0.0% , E223 0.0% , garlic 0.0% , Onion Extract 0.0% , corn starch 0.0% , psyllium 0.0% , Onion Extract 0.0%