Chicago food bleg

From a loyal MR reader and diner, who has excellent taste in food by the way:

Might you be willing to post another bleg, this one about Chicago? The results from the Toronto one were fabulous (and it also seemed to generate a good conversation among your readers). We’re headed there Saturday, and I’m disappointed so far in my research efforts…

I don’t have a trip scheduled just yet, but I am sure I will benefit from your answers as well.  We both thank you in advance.