You must go to Kinkead's. I believe they are in the Foggy Bottom area and close to a metro stop. The Ipswich Fried Clams are the difinitive verison. Make a reservation by phone before you go to Washington or you'll never get in. In a pinch, there is a bar area with some tables where you can order the clams. Don't miss them !! Visit the web site www.kinkead.com