Across the United States, artisanal pizza joints are opening faster than Natalie Portman movies. But inside those imported ovens, pepperoni — by far America’s most popular pizza topping — is as rare as a black swan.

In these rarefied, wood-fired precincts, pizzas are draped with hot soppressata and salami piccante, and spicy pizza alla diavola is popular. At Boot and Shoe Service in Oakland, Calif., there is local-leek-and-potato pizza. At Paulie Gee’s in Brooklyn, dried cherry and orange blossom honey pizza. At Motorino in the East Village, brussels sprouts and pancetta. But pepperoni pizza? Geddoutahere!

What, exactly, is pepperoni? It is an air-dried spicy sausage with a few distinctive characteristics: it is fine-grained, lightly smoky, bright red and relatively soft. But one thing it is not: Italian.

“Purely an Italian-American creation, like chicken Parmesan,” said John Mariani, a food writer and historian who has just published a book with the modest title: “How Italian Food Conquered the World.” “Peperoni” is the Italian word for large peppers, as in bell peppers, and there is no Italian salami called by that name, though some salamis from Calabria and Apulia are similarly spicy and flushed red with dried chilies. The first reference to pepperoni in print is from 1919, Mr. Mariani said, the period when pizzerias and Italian butcher shops began to flourish here....
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