Matt's Bar in Minneapolis claims to have created what cheeseburger that has the cheese inside the meat patty?
Matt's Bar:  It is known as one of two businesses that created the Jucy Lucy. Jucy Lucy: A Jucy Lucy ["sic"] or Juicy Lucy is a cheeseburger that has the cheese inside the meat patty instead of on top, resulting in a melted core of cheese within the patty.
Jucy Lucy