Affordable, tasty food near the Smithsonian Museums?

I am going on vacation soon to Washington D.C, and my boyfriend and I are taking a day to see the Air and Space Smithsonian, the Natural History Smithsonian, and the American History Smithsonian. We are putting together our itinerary and we are having trouble finding a good place to have lunch, that is in walking... show more I am going on vacation soon to Washington D.C, and my boyfriend and I are taking a day to see the Air and Space Smithsonian, the Natural History Smithsonian, and the American History Smithsonian. We are putting together our itinerary and we are having trouble finding a good place to have lunch, that is in walking distance of these museums. We don't want to spend a ton of money, but we don't want to have to resort to fast food because we can get that at home, and usually when we are on vacation we like to try local places because they serve food that is only served at that one location. We are into most types of food except sushi. Any suggestions? :)
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