I was in the new-ish place along Comm Ave in the BU area that is a Lollicup tea place/ Spice King just to see what was there. They have lots of beverages but little food - but the food that they did advertize was basically a Chacarero sandwich - chicken or beef or portabella mushroom with cheese, guacamole, green beans, and also red pepper. Prices 5.50 and 6.00.
I was just on a scouting trip so didn't try one, but will soon. Thought people might want to know about the vegitarian (mushroom) option, and another possible location for this sandwich type. I wasn't aware of Chacarero until the thread a few weeks ago, stopped by one day after work and loved it. Thanks very much to everyone who posted about it.