For a city that has such clearly defined and cherished food forms as hot dogs, pizza, and steak, New York City does not have a single, dominant burger style. While some of the nation's oldest and most storied hamburgers are sold here — such as those at '21' Club, P.J. Clarke's, Burger Heaven, Corner Bistro, and Peter Luger Steakhouse — there is little commonality between them. They evolved separately, rather than as part of a larger, cohesive movement. By comparison, the burgers that proliferate in Southern California, for example, tend to share a common architecture and flavor profile, representing a distinct style.