A mouth-watering cheeseburger with a juicy beef patty, melted cheese, fresh lettuce, and ripe tomato slices, all perfectly stacked in a sesame seed bun - Esilzengin/Getty Images In theory, a burger is ...

In theory, a burger is a simple concept. It should be comprised of a bun, patty, then a few other toppings added to your own taste. A simple concept — that is, until you take a bite and the middle ...