Copyright © 2017–2020 by National Today. Submit your idea for a great burger and you could win free burgers for a … Of course! May 28 is National Hamburger Day. Numerous deli and diner owners across the United States claim that their joint is responsible for inventing the burger. Do you need another reason? Get fancy with it — many fine dining establishments serve high-end burgers on their menus. status : false, The recipe for the hamburger is so well established — why not have some fun with it? Let today be your opportunity to come up with all kinds of crazy burgers, and have some fun cooking.