When in Montreal...you've got to try the smoked meat sandwich at Schwartz's. There might be a line out front, but it goes fast and you are quickly shuttled to a table.
The normal thing to order here is a smoked meat sandwich, lean or medium fatty (I got medium) and a Cott's Black Cherry soda. I recommend just going with the flow and ordering it - there's a reason that's what they're known for. The sandwich is served on rye with mustard...and that's all it needs because the meat is so flavorful. I really enjoyed the soda and got it on every visit. We did split an order of fries for the table, which were fine - but really the sandwich is the star here.
I see people comparing this to the Katz's pastrami sandwich in NYC, and personally I'd rather have Shwartz's smoked meat sandwich - I just love the spices and while it's plenty filling, it isn't piled so high that you can't eat it comfortably.