This new vegetarian fast food place (Maoz) just opened on M Street NW in DC (near corner with 18th
I've already been there a few times (it's close to my work).
Basically, for $4.95 you get a falafel on pita (choice of whole wheat), then load it up at the fix-ins bar.
Maoz is very similar to the Amsterdam Falafel Ship in Adams Morgan further up 18th Street, but Maoz is located in the heart of the business area which makes it convenient for lunch.
I normally head over to 25th Street for the Trader Joe's for lunch, but Maoz is a compelling option.
If anyone would like to meet up, let me know.