Grand Cata at Mosaic, web site, 8298 Glass Alley Unit 100, Fairfax, VA, 571-378-0684. (Metro Trip Planner – opens in new window) [Google]
Chilean and Argentinean, in part a shop for fine wine but excellent food as well. The best empanadas around? First-rate tuna pate. Very good grilled cheese sandwiches. That sort of place. Lots of charcuterie board. More of a sit-down snack site (two tables and a counter) than a full restaurant per se, but you can definitely eat a full meal here and go away very happy. They also have a Chilean choclo dish, I will try that next time.