McDonald's and Burger King's rivalry has inspired some of their products.
Burger King has added variations to the Whopper but never removed it.
Wendy's was the first fast-food chain to use blue cheese on a burger in the early 2010s, according to HuffPost
McDonald's first tried to make a premium burger for sophisticated adults with the Arch Deluxe in 1996.
Whataburger's burgers are large and customizable
Jack in the Box was the first major fast-food chain to offer sirloin burgers with cheese, onions, and bacon in 2007.
Burger King released Burger Shots, mini broiled burgers in pairs, in 2009. Burger King had previously made mini burgers
Wendy's has tried different cheeses on its burgers before
As we've seen, fast-food restaurants like to experiment with ground sirloin and ground beef in their burgers.