Two years ago on the eve of the Roadfood.com tour of Massachusetts clam shacks and roast beef houses, a few eaters met at a pub on Beacon Street in Somerville called R.F. O'Sullivan & Son for hamburgers. The burgers were delicious, but for some reason I took no pictures of them. And somehow, I didn't make it back ... until today, when the person I was to have lunch with in Boston asked where I'd like to go. O'Sullivan it was! And while business prevented me from sampling lots of things and paying enough attention to write a review, I did snap this picture of a "black and blue" burger. That's a half-pound patty rolled in cracked black pepper and smothered with blue cheese sauce. Those fries and onion rings on the side are pretty grand, too.