Fried onion burger

01 / ABOUT THE DISH

About the dish

The fried onion burger is a regional hamburger style from El Reno, Oklahoma, made by pressing a ball of ground beef onto a griddle piled with thinly sliced onions so the onions cook directly into the meat. It is served on a soft bun, usually with mustard, pickles, and sometimes cheese. The item originated in the early 1920s and 1930s, when short-order cooks along Route 66 and in small diners in El Reno began pressing onions into beef patties as a cost-saving measure during periods when beef prices were unstable but onions were inexpensive and abundant. The method allowed cooks to stretch a small amount of beef while maintaining the appearance and size of a full patty, and the style eventually became an established menu item in local cafés. Preparation follows a specific sequence: onions are sliced very thinly, often with a mandoline, and placed in a loose pile on a hot, greased griddle. A ball of ground beef, usually made from an 80/20 blend, is placed directly on top of the onions and smashed firmly with a spatula or grill press. As the patty cooks, the onions soften and caramelize against the hot surface, adhering to the meat while releasing moisture and sweetness. The patty is flipped once, keeping the onions in place, and allowed to finish cooking while the bun warms on the griddle nearby. The burger is typically assembled with mustard and pickles, though the exact toppings vary by diner. The fried onion burger is eaten primarily in El Reno and surrounding parts of Oklahoma, where several long-established diners still prepare it on flat-top griddles seasoned by decades of use. It is commonly served as a lunch item or casual dinner entrée, often accompanied by fries, onion rings, or a simple side salad. Beverage pairings include iced tea, soft drinks, and light, crisp beers that complement the savory flavor of the patty without overpowering it. In many diners the burger is served without elaborate additions, leaving the combination of beef, onions, mustard, and pickles as its defining profile.