Well...theres battered mars bars, they'd kill you from eating too many... Then theres haggis - it's great (although not many people would agree).
Well, being stuck in the "dairy state" Cheese is big around here. But I would have to say that Brats are THE #1 food here. Personally I would prefer Thai food or Seafood. Next to impossible to find a decent Thai place in the mid-west.