Top sandwich for pickle enthusiasts
The chicken shawarma sandwich at Armenian Market & Bakery (next to Waterotwn Mall) features fresh pita and chewy-but-moist chicken with a tasty sauce, but the high point of the thing is the intense pickle flavor. It hits a distinctly different flavor point, in contrast with most local shawarmas.
The rest of the market is underwhelming compared to your options along Mt. Auburn St, but go for the sandwich.
That is a great sandwich. Pita Thyme in Liberty Square hits a similar note - I think they both use pickled turnips.
One other item they have that is great and unusual is homemade sou boureg. It doesn't have the standard parsley in it, but the noodles are handmade, and really good. I don't know of anywhere else that has this fresh.