This is probably my all time favorite bar in Baltimore and, at one point, held the brief distinction as the "Best Bar In America" (http://www.esquire.com/bestbars). Brewer's has an amazing restaurant menu and a really good bar menu, as well as their own Belgian-style craft brews. The dungeon bar (and I mean "dungeon" in the most positive sense possible) in the basement is unlike any other place in Baltimore.
As for the burger, they keep it very simple with lettuce, tomato, onion, and Vermont sharp cheddar. This was a melt-in-your-mouth kind of burger. The roll was soft like a cloud and the toppings were fresh and crisp. The meat was cooked to medium well, but still incredibly tender and flavorful. I can't forget to mention the amazing rosemary garlic fries.