Example in the other direction: "baks" (бакс), from English plural "bucks", was borrowed into Russian as the singular colloquialism for a US dollar. A hundred bucks would be "sto baksov" (~ a hundred buckses).
I got a hundred buckses in my pocketses.
Or how we say "tamale" as the singular of "tamales" when the singular is "tamal" in Spanish.
I'd hazard that all of the prepared food one's come from the vendor having multiples.
Nathan's Famous Hotdogs, not singular. As it would be Giovanni's Pannini shop and Boris' Perogi shop.
And along the same lines, in Italian a sandwich is a panino. In English we call a specific type of sandwich a panini (or, "a sandwiches").
I recently ordered the Arancino at a local Italian restaurant, and was confused when I got only 1, then I remembered how Italian plurals work.