I have posted in the past about the food of Sicily. Basically, it is entirely different from that of southern Italy. For one thing, they use more couscous and rice than pasta. For another, the menu is heavy on seafood and grilled meat. Lots of eggplant.
Muslim invaders ruled Sicily for long enough to shape their culture. Ruled it wisely and softly, too. Can't say the same for the subsequent Viking rulers who fortunately had little impact on Sicilian cuisine.
Arancini is their street food (a fried thing made of rice with tasties in the middle). The local blood oranges are a typical dessert.
There is little authentico Sicilian food in the US. Pizza is not Sicilian, and neither is tomato sauce. I know of one decent Sicilian restaurant in NYC: eolo