A bit of a muddle, but here's what I think is going on: a bunch of super-WASPy looking people pretend to be Italian so that they don't have to remove the original names from their restaurants. They make what to my eyes looks like Atlanta-style pizza, basically a kind of tomato-covered taco, and can't understand why nobody in Chicago, which has its own pizza tradition, want to buy it. They jump to the wrong conclusion, which is that an even worse pizza chain down the road is siphoning off their business. No doubt because they've seen millions of movies like this one, the main characters decide that the way to compete is combine one restaurant's crust with the other restaurant's toppings. Since neither is recognizably an ingredient in "pizza" in Chicago, it is unlikely to work, but through the miracle of TV movie magic they get enough of the third restaurant's business to stay afloat. Maybe even earn enough to finance the next movie's restaurant, which will be a kosher-style lobster-and-pork-ribs joint in Brooklyn.
"Evanstown?" Seriously?
"Evanstown?" Seriously?