I'd hardly call "Italian ice" a Chicago-centric food. Altho there are many good examples here, on hot summer days you used to be able to find a comparable version on almost every street corner in South Philly (or Brooklyn, probably, or any other city with a tradition of Southern Italian immigration). Here's a related note from Wikipedia:
"In October 2007, Dennis Moore of "Little Jimmy's Italian Ice" in Elizabeth, New Jersey, submitted the term "Italian ice" as a possible addition to the Acceptable Identification of Goods and Services Manual of the United States Patent and Trademark Office."
"The fork with two prongs is in use in northern Europe. In England, they’re armed with a steel trident, a fork with three prongs. In France we have a fork with four prongs; it’s the height of civilization." Eugene Briffault (1846)