R. F. O'Sullivan & Son Pub

Some of the best burgers in Boston ! Ordered the Jalapeño burger and enjoyed every bite! You must get half & half (part fries , part onion rings ) with your burger :)

Offers some of the best burgers in the Boston area. Cooked to order, thick and juicy and with a ton of options/toppings available as well . There like 20+ different ones.

The patty is totally unsalted which is strange :/ Skip onion rings and go for house fries (big chunks of real potatoes !) Blackjack burger 10.95$ is quite spicy . Overall, good price/quality ratio.

Very good selection of burgers , good draft Beers and Not crowded during the pats Game on a thursday!

No matter what you order for food, make sure to ask for a side of the Black Jack sauce. It's killer and goes well with everything!

No matter what, dont cut it in half to share. First of all, it's a delicious burger , you'll want more than half. Second, the thing is loaded and will fall apart . Bocce ball is really good.

We only had a beer and some fries but the fries were amazing and the burgers looked great. The fries are huge too.

Burgers are awesome, and huge! Fries and onion rigs are fabulous. Ask for half and half so you can try some of each!

You can't go wrong with any of the burgers . Also consider the buffalo chicken or jambalaya

The half-pound patties are so large (they're almost round when they hit the grill) that they require patience as they cook. As an added bonus, large, hand-cut fries arrive with your hamburger . Read more

So many burgers to choose from. Go baconnator and a few brews while your waiting for it at the bar .

Best steak fries !! Rings are good too, and of course the burgers are phenomenal!!

Black and blue burger is the bomb. All plays ate big enough to share. The steak knife helps cut the burger .

Blackjack burger ! Get half and half on the onion rings and fries . Bomb dot com.

Easily one of the best burgers in town . Decent selection of beer . Often crowded .

Just the best burgers on the planet. Onion rings are pretty good too!

Love that they offer half and half instead of making you choose between their awesome fries or onion rings !

Great burgers ! Definitely get half and half on the fries/onion rings

Check out the specials and add peppers and onions to your burger . I like the Stella and Guinness on tap here because they pour them the proper way into the right glasses!

Believe the hype — they serve a great burger .

The best burgers in Boston . Also, awesome buffalo wings . Hold court on Mondays for trivia . Arrive early.

Loved my Swissroom burger , and the fries were also good (if atypical).

Bleu burger was awesome!! Love the thick patty and steak fries :)

For vegetarians , you can substitute veggie patty in any burger :)

They're known for their burgers , and they're big burgers . Be ready.

They don't squish the patty, so start doing mouth stretches now.

Burgers . Some good local beers on tap , too.

Bunless burger with salad is entirely satisfying.

The burgers are simply the best!

The JD Burger is great, R.F O's also cooks it how you ask unlike many other burger joints

The cheese nachos are good! (I love the fact that they use real cheese ) Half onion rings & half fries w/burger ;)

Try the empire state burguer

If you haven't had the burger here yet, I don't know what to tell you. Amazing!

The blue cheese burger is just a burger with blue cheese dressing (disappointing). Also, their onion rings are far superior to their fries .

The BlackJack burger is great if you like a little kick on your burger .

For the vegs the ceaser salad is great!

Best burger in Boston . The fries are simply hastily cut up whole potatoes . Ask for half fries , half onion rings .

Amazing steak tips . Well seasoned.

Just go here and get what you like. AMAZING burgers and good steak fries too!

Such great burgers in a real neighborhood bar & restaurant . The perfect place for a late afternoon lunch on a Saturday.

Get the blackjack! Amazing!

The Paddy-O is pretty legit. But I'm a guy who likes lots of onions .

Great burger , but really, no free refills on soda ?

favorite burgers in mass!

Try the Blackjack Burger - Cajun flavored burger

Still rules the Boston burger roost in my opinion!

Can't go wrong with either a Blackjack or a Black and Blue burger . Wash it down with a $3.25 PBR tall-boy

I was told this location was permanently closed and the only store still operating is in Lynn.

Best burgers in town !!!

Great Burgers . Try the boneless buffalo tenders.