America’s most dangerous hamburger was invented in 1954 in Minneapolis, but both Matt’s Bar and the 5-8 Club, a good three miles apart on Cedar Avenue, have staked claims as the originator of the juicy Lucy. (Matt’s Bar spells it jucy Lucy.) It is an inside-out cheeseburger, meaning the cheese is completely secreted inside the meat. As the beef cooks, the lode of cheese inside melts. If an unsuspecting eater takes a hearty bite of one hot off the grill, the molten center erupts and can seriously hurt tongue, lips, and fingers. Experienced eaters know to wait a while or to gingerly hoist the burger and take a dainty bite that reveals just enough of the cheese cavern that some of it can be dripped onto accompanying French fries. American, Jack, and Swiss cheese are the common fillings, but more exotic cheeses may be used, and the cheese can be supplemented by peppers, bacon, olives, or mushrooms.