Thanks to MB's note, I went to the Cambridge Carribbean Carnival on Sunday and found the roti I had been looking for! There was only one roti stand, where I ordered roti with curried chicken. The roti was beautiful: big, fragrant, layers of chickpea flour with a little bit of spice. The curried chicken was pretty greasy (a pool of yellow grease was at the bottom of my roti) and had a lot of bones in it, but it tasted great. Not an easy food to eat while wandering around Central Square, but well worth the greasy fingers and $6. AND I was able to get a menu from the place: Singh's Roti Shop, at 629 Columbia Road, Dorchester. 617-282-7977. The servers were impressively nice and attentive. They only had the chicken curry at the event, as well as some desserts that looked great but were kinda eh -- packaged elsewhere and/or stale. (Tamarind Ball, Red Mango strips, Coconut or Cuurent Roll and these weird french fry looking things.) The menu is much more comprehensive, including goat, veggie, shrimp, etc. as well as sads and apps.
I also bought a piece of the roti bread alone to keep for later, but somehow it never made it home. Hmmm. :) Thanks for the tip, MB!
Otherwise at the festival, there was a lot of jerk chicken, goat, fish and beef "patties" (kinda like an empanada and quite good). I also tried these strange small green fruits that were like small limes with a pulpy seed at the center. Wasn't crazy about them -- kindof astringent. Reminded me of kumquats?
As a chowhound, this was a great opportunity to try some fun new things and dream of a trip to Barbados. And amazing people watching!!!