Desperate for a bite of lunch after landing at Billy Bishop and before departing from Union Station, I turned to Yelp, which pointed out the Sushi Shop in the Union Station food court. This really was a perfect find - not a fast food option, nor one to cause a tummy ache from sugars or gluten (too personal?).
Staff here are warm and friendly, and were easily able to accommodate a swap of tempura for cukes in the roll I requested. I had a few minutes to spare, so I opted for a few choice from the menu, but those in a rush can grab the pre-made items that are packed and ready to go.
These guys really have take-out sushi figured out; the soy sauce comes in a small dish, with a sealed lid you can pull back to create a little vessel of soy waiting for your sushi! Best I've seen for take-out sushi.
Will be returning on my next trip through Union Station for sure.