Need to get to the Brattle by 6:30pm on Thursday, and will be taking the red line to Harvard Sq station (arriving between 5:30 and 5:45ish). Looking for a quick, but good, bite. Open to anything - just need it to be fast and yummy. Trying to avoid chains like Au Bon Pain & Chipotle. Any recommendations? I realize it's been a while since I've headed to that corner of Harvard Sq.