@ Lauren: a little tricky to answer, since you don't say what "ethnic food", and what's "groovy" for you, etc.
anyway, i guess you are ethnically polish so either you look exactly for the opposite or for it... dunno
but since it's just a cut&paste from an email here it is...
personally i really quite like the Cafe Lura but it had been quite some time since i was last in chicago.
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Cafe Lura
3184 North Milwaukee Avenue
Chicago, IL 60618 (Avondale)
polish beer (Okocim, Zywiec, Tyskie), czech beer, Żubrówka, decent pierogi
IMO a very nice place, and as such a mix of performace venue (very diverse: goth, electro punk, grindcore, jungle, dubstep, etc.), bar and bistro.(& much more eclectic / intellectual than e.g. Jedynką Club)
youtube has some recordings from previous gigs there...
http://www.youtube.com/watch?v=3EtwUKgluA0
http://www.youtube.com/watch?v=fJrqxPvePqg
google "cafe lura" provides still more info, but best is simply to check it out for yourself.
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The Exchange - Lounge Bar
1270 North Milwaukee Avenue
Chicago, IL 60622 (Wicker Park)
never been there, but have been to the previous Lava Lounge (former dubstep lounge at the same address)
a friend says the The Exchange is no longer really a dance lounge but more a cocktail / drink lounge; says sound is good and not too loud, so conversation is easy with out shouting at each other..
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Jedynką Club
5616 West Diversey Avenue
Chicago, IL 60639
Polish techno club;
very polish kitsch / sexy dress / go crazy atmosphere;
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other ethnic polish venues in Chicago: ToTu Cafe (2300 River Rd.), Paris Cafe (5301 W. Belmont Ave), etc.