Driving by Cleveland/Akron

I'll be passing through on I-80 around dinner time in this area. I would like to try a distinctive restaurant--casual independent, ideally--that doesn't involve much of a time delay. Does a detour into Cleveland or Akron downtowns cost much time? (I'm fine with driving 15 minutes or so off the highway). Or is it even necessary? Maybe there's some worthy roadfood joint not far from the freeway?