Stopped here after a long walk through the Moore Park ravine, and the Aye Caramba sandwich -- flank steak with tomatillo and corn salsa in fresh bread -- was just what the doctor ordered. While the portions aren't huge (especially given the somewhat high prices) the food seems artfully prepared with high quality ingredients. Oh, and did I mention delicious? My companion had a small bowl of chili which was also very appetizing and featured chunks of steak rather than ground beef.
If you're near St. Clair and Yonge, this is definitely a nice place to pick up lunch to go. (They have a few seats, including a couple stools on the street, but mostly it's just a counter.) They also have a few take-out dinner options and they do catering.