Rare is a niche restaurant that does 2 things extremely well. Roast Beef sandwiches and Soup. Your typical combo either is a sandwich with a soup or salad. What you want to get is relative but either choices are fine. I recommend more of the soup in the fall and winter periods and salad for the summer time.
Basically get their signature food, the Roast Beef sandwiches. They have nice roast beef sitting on a cutter and churns out the slices when you order. They then soak/warm the sliced roast beef in beef broth retaining/enhancing the beefy flavours before putting it on a bread with your dressings. Then in it goes to a toaster and it comes out hot and toasty. It is as good as it sounds. Only flaw I noticed is do not take your time eating the sandwich. When it goes through the beef broth it becomes wet which soaks into the bread causing soggy bread. The longer you take to eat the more soaked the bread becomes until it falls apart other than that I still grab an order there before heading off to night class at Ryerson.