"Pound a slice of round steak. … Fry two or three onions, minced fine, in butter until slightly browned. … Broil two or three minutes. Spread with butter, salt, and pepper." Though legends abound as to the origins of the first hamburger, the first printed recipe for "hamburger steak" appeared in _The Boston Cookbook_ in 1884, forever linking the Hub with America's favorite sandwich. More than a century later, burgers are bigger than ever in Beantown, and you're just as likely to find fried onions on your burger as jalapeños, fried eggs, hot sauce, or even another burger.