Capitol City Brewing Company
If you find yourself in Washington DC and craving a burger n' beer for lunch or dinner, consider The Capitol City Brewing Company. I ate there on my recent vacation, and was very happy with the burger. It's a 1/2 pounder, and this place will cook it any way you want it. In recent years, they look at my like I'm crazy if I ask for a burger cooked medium...this place doesn't bat an eyelash at that request. Burger was thick and juicy, served on a good bun, and choice of several cheeses is available as well as bacon.
Wash it down with Capitol City Kolsh, one of the microbrews available at Capitol City Brewing Company. It's a great German-style beer.
Bonus: when you order your beer to start, you'll be given a basket of hot soft pretzels w/ grainy mustard for dipping to tide you over while you wait for your burger!