See Philly Cheese Steak

The cheesesteak is truly a singularly American food known for it's sublime taste and astronomically high calorie count. However, if you think you've had a cheesesteak and you weren't in Philadelphia, you haven't really had a cheesesteak. For some reason, no one outside a 100 mile radius of Philly seems to be able to make a decent one, and the further away one gets from Philadelphia the worse they become. I can only imagine those made in California are horrendous to a toxic level.

Incidentally, this food is one of the few over which I have regrets about becoming a vegetarian.