There is one at the NW corner of Derry Rd E and Goreway Drive (one block east of Airport Rd & Derry Rd). It's a dingy mom and pop place in the strip mall and everything is super spicy. It used to be my favourite lunch spot, I still visit it whenever I'm near the airport.
It's about 5 minutes driving from the airport. All you have to do is follow the signs that say "Airport Road North" from the Pearson, go north until you hit Derry Rd (the first major intersection), then travel east.