Not that I noticed. Outside of salad, there maybe a few choices.

A large section of the Berlin Wall was donated by the citizens of Berlin and the employees of Daimler-Benz in recognition of President Ronald Reagan’s leadership which contributed to German reunification. This segment is from an inner-city section of the Berlin Wall near the Brandenburg Gate, where on June 12, 1987, President Reagan issued his challenge: “Mr. Gorbachev, open this gate! Mr. Gorbachev, tear down this wall!” A symbol of the East-West division and conflict for 28 years, the wall that divided the city of Berlin crumbled. Located at the Woodrow Wilson Plaza entrance, the Wall segment stands over nine feet high, three feet wide and weighs nearly three tons.

I honestly couldn't say. There are only fast food outlets, none of which we fancied as we aren't fast foodies, so we just opted for ice creams instead and had lunch in one of the museum cafes instead.

I didn't see a parking garage. I would just take the Metro train because it is very convenient and cheap - and walking around DC is not too cumbersome. Just be careful and watch where you're stepping so you don't slip and fall (I broke my femur there in October not paying attention and fell down a short flight of steps).