BLT Steak, Washington D.C.
I had a cheeseburger here too. I was eating lunch with Abby, the little sis. Weekday lunch surrounded by some serious looking politicians and business professionals. Even saw a couple people reading the newspaper, so I knew they were dead serious.
BLT is solid, always. Locations in a few big metro centers. That steak tartare over guac was the truth.
Look serious and important when you go here if at all possible.