Oklahoma’s famous onion burger is made by smashing caramelized onions into one side of a beef patty as it cooks, topping the patty with cheese, then slotting the whole thing into a bun. It was naturally born during the Great Depression, as cooks everywhere bulked out burger patties with cheaper extenders. Ross Davis of the Hamburger Inn in El Reno is credited with creating the dish, which is perhaps more popular today than ever.

Liked this? Click the Like button above. And click the Follow button above for more great stories from loveFOOD

Now discover the best kitchen gadgets from every decade

Last updated by Jessica Morris.

The delicious dishes born out of hardship