This Saturday, May 2, marks the 21st Annual Fried Onion Burger Festival in El Reno, Oklahoma, home state of the onion burger. Head to downtown El Reno from 10 a.m. to 8 p.m. for music performances, carnival games, a car show, and plenty of onion burgers, including a kiddie pool-sized "Big Burger." Visit NewsOK.com for a video of onion burgers in the making.