I'm taking the train to New York tonight, boarding at Back Bay Station around ~6:45pm. I'd love to get some good, cheapish, chow-ish takeout to bring with me on the train. Can any of you suggest such a place within, say, a ten-minute walk of the station? Cuisine doesn't matter, I'll eat just about anything - though I'd prefer something besides pizza tonight. And I'll spend up to about $15 or so.