The origin of the bagel, Smith tells NPR's Scott Simon, "is somewhat mysterious." What's certain is that bagel met and married lox in New York, she says. Smith was also one of the editors of Meatpaper — and a former NPR intern. Bagels are a true American melting-pot meal, she says.

"These mash-ups are what American does best," she says. "The cronut and ramen burger — those were also invented in New York. But in those cases, you can trace it back to a specific person. In this case, it seems to have just sprung like Venus from the clamshell. The bagel [and lox] may just be our greatest triumph. That, or the burger."

But, as in so many modern unions, both partners came to the marriage with plenty of baggage.

Lox, we learn, come to us via the Scandinavians, who mastered the art of preserving salmon in saltwater brine, but also via Native Americans, who smoked and dried the fish's carcasses for food and currency. The capers come from Italy, while cream cheese has roots in Britain.

As for the bagel? Smith writes that this ring-shaped treat is "suspiciously similar" to a bread that Uigher merchants sold along the old silk route in China. And in Italy, she notes, a bagel-shaped bread called a taralli was sold as early as the late 14th century — "though it was reported to be both sweeter and harder."

"The circular nature of ring breads inspired philosophizing: they symbolized life, death, yearning, good fortune, inclusiveness, solitude, union, the hole at the center of all existence," Smith writes:

"But they were road food, eaten by pilgrims and traveling merchants, carried while stale and then dunked in a hot liquid when they needed to become soft enough to eat. The staleness was a form of preservation and aided in transportation — the hard rings could be strung together and carried, like beads on a necklace, the same way that bagel sellers would carry them through the Lower East Side centuries later."

So how did the bagel leap from being a New York street food to standard brunch fare across the country? Thank the Lenders brothers, says Smith: They capitalized on refrigeration technology early on to sell bagels packaged in a tube to the rest of America.

"They knew in New York, everybody ate bagels," she says. The family "seemed to spread outside their own ethnic origins in the way certain foods do, like pizza." The Lender family had the foresight, she says, to grasp that the rest of America would also embrace this baked treat.

Copyright 2013 NPR.

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No Schmear Job: A Brief History Of Bagels And Lox