The New York slice.
Meaning pizza. It feeds everyone on every corner of the city. Good for tourists and locals. It's classic. It can be high brow or low brow. It's delicious, when done right. It's red and white and sometimes green, depending on your pizzaiolo's use of basil. It's a balanced meal of carbs, protein and produce (if you count tomato sauce, we mean). To this day it still gives new immigrants a business to buy into. It may or may not be invented here, depending on your definition of invented. Heck, it even regulates the cost of the subway ride! (PS, the photo is from DiFara in Midwood, Brooklyn.)