So...was searching Foggy Bottom restaurants, and stopped where I started.
How about "Founding Farmers"?
It looks interesting - serves weekend brunch, has a vegan menu, can accommodate parties up to 12 (if we have more, we'll make reservations for 2 groups and request side-by-side tables).
It's at 1924 Pennsylvania Ave. NW, in the International Monetary Fund (IMF) HQ2 building. Metro stops are Farragut West or Foggy Bottom.
Anyone have any experience with it?