Smashburgers feature irregular edges and usually fried onions. They are best when made on a flattop griddle.
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Blame it on the smashburger. Also known as the Oklahoma-style burger (even though it seems to have originated in Kentucky or Tennessee, go figure) this style of burger (a ball of ground meat smashed down with a spatula into an irregularly shaped patty, usually on top of a bed of grilled chopped onions) has become wildly popular in recent years, leading to a national chain of the…

