It's a tough question- what does Toronto excel at food wise that can't be had at the same quality anywhere else in Canada or the USA.
I have a very good buddy- who is very well traveled in town tomorrow and I want to take him to eat something awesome- and uniquely so- in Toronto.
What comes to mind is "Ethnic". I'd love to try a place that is unique to our melting pot and has amazing food - perhaps that he's never had! Atmosphere and pricing are not nearly as important as my taste buds.
Difficulty +1- Has to be downtown - or at least on a subway line and have tables to eat in.
Carribean food came to mind and I scrounged the board but only came up with Carribean Bistro- but I'm certain you all can do better than that.