Besides the burger patty itself, it adds elements not typically associated with pastrami sandwiches, such as lettuce, tomato, onions, and American cheese.

FORBES: 10 Great American Regional Foods You Should Taste In 2012

One such conservative told me my bacon and Parmesan burger is really a sausage patty because it's made with pork.

NPR: Building a Better Burger

My take on it is that a burger is composed of some sort of ground meat, formed into a patty, cooked and served in sandwich form.

NPR: Building a Better Burger