I have to concur with
jeff_deff, these were a few of the things I would have suggested if he hadn't already -- duck tongue in X/O sauce is honestly one of my favorite new dishes, and Chicago's Chinatown is full of authentic and truly odd offerings. Chi Cafe is a nice little modern Hong Kong style restaurant. I also love the bakery on Wentworth that has marinated (cold) chicken feet that you can order to go, but I can't remember the name right now.
Perhaps also look into Chicago's new obsession with all parts of the pig, from the offal to the ears and everything in-between.
Two places I've been recently,
Purple Pig and
Longman & Eagle both had some interesting offerings and are on Chicago's "hot" list right now.
Also had some really great spicy thin-sliced pig ear at the International Mall / food court in Westmont over the weekend. The China Cafe there offers great Taiwanese breakfast items on the weekends.
I have not been there yet, but Irazu [Costa Rican restaurant] has an oatmeal milkshake that's supposed to be awesome. Last time I drove by there, they were packed, so they must be doing something right. They also offer a Cornmeal milkshake. (??)
I think for sure, something in the Mexican category, though, since Chicago has such a great history of upscale and street-style Mexican food. I don't think you can get much weirder than eyeball tacos. It would be interesting to see the juxtaposition between Maxwell St. Market stand food and Rick Bayless's take on it.
Also... while you're at it, you could stop by for a
Malort-based cocktail at Bar DeVille. Heh.
Good luck with your research!
Chi Cafe
2160 S Archer Ave
Chicago, IL
312-842-9993
International Mall
665 Pasquinelli Dr
Westmont, IL
Purple Pig
500 N Michigan Ave
Chicago, IL
312-464-1744
Longman & Eagle
2657 N Kedzie
Chicago, IL
773-276-7110
Irazu
1865 N Milwaukee
Chicago, IL
773-252-5687
Bar DeVille
1958 W Huron
Chicago, IL
312-929-2349
-- Nora --
"Great food is like great sex. The more you have the more you want." ~Gael Greene