I realize there are a lot of burger joints in the world today and it may be a bold statement to claim "best" anything, but The Angry Dog in Deep Ellum (east of downtown Dallas) is seriously the best burger I've tasted in Dallas. Perhaps even the best burger I've had anywhere. From what I hear their hot dog is pretty decent as well, but I've never strayed from the burger after having it my very first time. (If it ain't broke, don't fix it!) If you go for lunch during the week, you'd be wise to go a bit early if you don't want to wait awhile because. lots of business people from downtown like to head over there for lunch.