Alek Krautmann on Monday tweeted a photo of his Panera purchase and called the vertical slices "the St. Louis secret".
A majority of the responses have been not-so-welcoming to the idea. He wrote it would never happen in NY.
New York's senior senator joined the conversation Wednesday, telling St. Louis in classic NYC-fashion, "fuhgeddaboudit". "And if its not, it should be".
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New York City's 311 service tweeted out "real New Yorkers know there is only one way to slice a bagel".
Other twitter users responded in disbelief at the practice and tweeted back.
A St. Louis weatherman, now based in Washington DC, set off an internet firestorm in recent days when he posted a picture of the bagels he brought into work - sliced like loaves of bread.
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The only people who didn't seem to understand what the fuss was about was the Panera bread chain, who had sliced the bagels for Krautmann.
Another St. Louis delicacy: Banana sandwiches.
But now, Twitter has introduced us to the "St Louis" method of slicing bagels, which means cutting them vertically.
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How do you serve your bagel?