“The now-iconic square patty—which debuted in 1921 at the first White Castle in Wichita, Kansas—was the first burger to spawn a fast food-empire: by 1930, White Castle had 10 U.S. locations. But more importantly, the restaurant’s emphasis on cleanliness—facilities were white and customers could watch their burger meat being ground through a window—helped quell fears that all ground beef was as unsanitary as the stuff depicted in Upton Sinclair’s best-selling The Jungle, which was released in 1906. Its success paved the way for the great American burger obsession.”
— Sarah Begley, “The 17 Most Influential Burgers of All Time,” TIME Magazine (links added)
“Slider (sandwich),” Wikipedia
White Castle website
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