I'm glad you bring this up. I miss the local food of Sioux City. I'll argue to the death that Sioux City has the best pizza anywhere. Jerry's Pizza and El Fredo's has yet to be matched. Townhouse has the best buffalo wings anywhere (although The Peanut in Kansas City is a close second).
Sioux City is my hometown and I love the place. I don't live there but I'll stand up for it when people bag on it.
El Fredo's has decent pizza for certain but I have had many pizza pies that I found to be better in many places...Great Plains in Ames for one.