Here’s one of the reasons I admire District Commons: During the most recent Restaurant Week, the Foggy Bottom newcomer let customers choose from nearly its entire menu, in the same generous portions it has dished up since opening in October. Whether you got a giant brick-pressed chicken or shrimp and grits during the promotion last month, the food was delivered by servers who, despite the crowds, appeared to be happy explaining the restaurant’s pretzel loaf and flagging the presence of 99 all-American beers at the bar.