After you go through Security in the Montreal airport, there are only two restaurants to choose from. Tim Hortons is good if you don't have much time and Moe's Deli & Bar is good if you want a sit-down restaurant.
I caught an earlier flight home today (12:15pm instead of 1:15pm) and still had an hour for lunch so I ate at Moe's.
I sat by the window and got some work done (free WIFI).
I've been to Moe's a few times and the food is good ... I've had a burger and chicken parm. I felt like something different today so ordered the jumbo smoked meat sandwich on rye and fries and a Diet Pepsi. As you can see, they aren't kidding when they call it "jumbo"!
I hadn't had breakfast this morning so was hungry. I managed to eat most of the sandwich, a couple of the fries, and none of the pickle or coleslaw. It was good and I was quite full afterwards.
The service wasn't the fastest, though, so I'm glad I had time. There were four servers and less than 20 people in the restaurant yet all the servers seemed to disappear for periods of time.