== Melted cheese? == 

 According to the article's lead, a cheeseburger is a hamburger accompanied with "melted cheese." Is it required that the cheese be melted to compose a cheeseburger? I've had a few cheesebugers they just put a thin slice of cheese in it and it wasn't melted at all... although it would be softer than the usual cheese as it was slightly warmed. Would that still qualify as a true cheeseburger?