Thanh Van Restaurant, web site, 6795 Wilson Blvd. #37, Falls Church, VA (Eden Center inside the corridor near the western side of the center), 703-639-0901 (Metro Trip Planner – opens in new window) [Don Rockwell | Yelp]
All-vegetarian and it appears to be all-vegan as well. Their Hue Spicy Soup is excellent and has one of the most interesting broths around. Their pancake is juicier and crisper than average. Overall the menu is limited but there are additional items on a buffet, of varying quality. For a vegetarian interested in Vietnamese, this place is a godsend, for others it is nonetheless above average and worth having in the repertoire.

That pancake looked great. I had spring rolls and faux pho. Both terrific. It’s just a little place without much seating, but it’s comfortable and the staff is very helpful. (I wonder what they substitute for the fish in their fish sauce.)
Thanks, Tyler, for reviewing this restaurant, which is my favorite in the nation. My own review of the restaurant, as a strict vegan, is here: http://katzjustice.com/underdog/FairfaxDWIlawyerFeb5..html