I'm surprised that, as far as I can tell, this hasn't been mentioned yet.
Potager is on Mesquite St in downtown (yeah, we have a downtown) Arlington. It's owned by a spectacular lady named Cynthia who really deserves a thriving business.
This restaurant is incredible-- there is no menu and no price. She cooks food from scratch every day from really high quality, natural (I believe even some home-grown?) ingredients. You then eat what you want, however much you want, and pay what you think it is worth. Please pay her a visit! I want the place to thrive so that I can continue to eat there :).