if you download the food truck fiesta app (or check their website) you might find a decent food truck

This is pretty much the case, but there is new stuff opening up near the ballpark. If you just stay on Maine Ave. eastbound, it turns into M Street, and the new stuff is on the other side of South Capitol.
Not immediately close, but easier to get to and different than the Fed Triangle/Metro Center area on the other side of the Mall.

There's a potbelly near there... On the way to mandarin, not sure it thats the kind of thing you wangt

Thanks, this was my impression (that there's not much) but wanted to make sure.

I don't think there's much nearby. But if you go up by the White House/Federal Triangle there are some good options.

Besides the restaurants at the Mandarin Oriental, anything else worthwhile? Looking for a sit-down place that's not fast food or a chain. thanks!