Brooklyn Athletic Club doesn't mess around when it comes to burgers, though your juice-soaked chin and hands may disagree. The restaurant's moderately seasoned, loosely packed patty, best enjoyed in pure, medium-rare form, is entirely juicy without being greasy. Along with the simple trio of lettuce, tomato and red onion, a healthy smear of house-made jalapeño and tomato jam brings the perfect balance of sweet and heat to the succulent monstrosity before you. A lightly griddled Slow Dough bun holds its fillings best it can, but don't forget the napkins.