Before the cooking begins, take a thin patty, top it with a wad of yellow or blue cheese, and then another patty. Pinch the edges together thoroughly and tightly so they don’t leak to seal in the goodness. Matt’s in in Minneapolis, MN, is the home of the original Jucy Lucy, and that’s right, there’s no “i” in Jucy. The molten core of the Jucy Lucy is cheese, but some folks use butter, especially herbed butter, and others insert sauteed mushrooms, caramelized onions, you name it. But those are Stuffed Burgers, not Jucy Lucys.