Michael Nish
Google
It's a very nice little cafe practically hidden among modern sculptures. Seating is somewhat limited inside, but terrace seating is a great choice on a nice weather day.
I enjoyed my Southwest BBQ Chicken Flatbread very much. It was very tasty. I even received a favorable comment from a passerby as I sought my seat under an umbrella outside. My wife had a vegetable and cheese quiche. It was also a very tasty dish, and it came with a fruit cup as a side. We concluded that this Cafe provides decent food. Prices are not too bad considering this location in the National Mall (you'll spend more money at food trucks, and food is much better here).
When you might need some respite from all your visits to various museums, this place fits your bill. Highly recommended!