The St. Lawrence Market is great! There are tons of picnic benches outside to sit and eat as well as stools inside. Check their website for upcoming events as well. It looks like they have a few good ones!

A quick hit list of where I go:

-Carousel Bakery for those peameal bacon sandwiches. They're famous for a reason
-Chris's Cheesemongers - ask for Len. He's a good friend of mine and well, just the best! These guys work hard.
-That said, my friend who is a cook and had the apartment swears by Olympic Cheese. I like its layout - you can pick up the cheese as opposed to ordering it at the counter.
-Buster's Sea Cove. Two words: Lobster Bisque. They don't sell the lobster rolls here on a regular basis. You'll have to go to their food truck for that.
-Stone Mill Bakery - GREAT bread. But for $4.95 a loaf? Show me the stone mill.
-Sheffer's - they sell prosciutto for $2 here on some days. In the grocery store, it's usually $6-8!
-Churrasco - chicken and soup. This guy works so hard and he pays attention to the little details down to the way he folds your bag. It's really quite charming. The chicken is moist. Really great bang for your buck.
-St. Urbain Bagels - yes!