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Hamburgers are the most popular sandwich items in America, if not the world. But most of them are too big and are far too unwieldy for single-handed consumption.
However, there is a solution -- the slider, the "Mini-Me", square version of the hamburger, which are cooked on large griddles in their own grease along with finely chopped onions, and laid onto small square steamed buns and packed into small paper boxes, which can easily be stacked into paper bags not unlike gun ammunition, ready to be fired into one's digestive system.
In the United States there are two large fast food chains which specialize in Sliders -- White Castle and Krystal. Both of who's products are almost indentical, but with a minor difference -- the White Castle is by default topped with ketchup and the Krystal has mustard.
Neither chain has store locations which can be found within proximity of each other, as if they have carved the United States into a
mini-burger war zone.