Bacon Wrapped Cheese Onion Ring Smash Burger To celebrate this annual day of burger appreciation I got stuck in and created this whopping, royal macdaddy cheese and onion ring smash burger. The legendary smash burger has been under the spotlight lately, for various reason, bottom line is this is an amazing cooking technique, originated in the USA and is popular globally. As always, your butcher knows best so ask them for ground beef with a 70/30 ratio meat to fat.