Burgers
K.O. Burger Chelsea
Burgers
Burgers That Pack a Punch
The Contender
Potato Roll, Smashed Patty, American Cheese, Smash Sauce, Griddled Onions, Pickles$7.00+
Knockout Burger
Potato Roll, Smashed Patty, American Cheese, Onions, K.O. Sauce, Ketchup, Mustard, Pickles, Pickled Jalapenos$7.00+
Lights Out
Potato Roll, Smashed Patty, American Cheese, "Oklahoma-Style" Griddled Onions, House Mustard, Pickles$7.00+
Meaty Boy
Potato Roll, Smashed Patty, American Cheese, Chipotle Mayo, Applewood Smoked Bacon, Onions, Pickles$9.00+
I'd Hit That
Potato Roll, Smashed Patty, White American Cheese, Black Truffle Mayo, Onions, Fried Shallots, Pickles$9.00+
Sides
Cross-Cut Fries
Golden Crispy French Fries$5.00
K.O. Cheese Fries
Golden Crispy French Fries, Griddled Onions, Cheese Sauce, Chipotle Mayo, Fried Shallots$6.00
Ring Side
Fried Breaded Onion Rings with a Choice of Sauce$7.00
Beef Loaded Fries
Golden Crispy French Fries, Chopped Beef Patty, Cheese Sauce, Griddled Onions, K.O. Sauce, Chipotle Mayo$12.00
Sauces
Ring Side
$7.00
Fried Breaded Onion Rings with a Choice of Sauce
Customize your item
Select 1
Request advisory
We'll do our best to accommodate special requests but may not be able to honor all substitutes. Extra charges may apply.
1
All hours
| Sunday | 11:00 am - 12:00 am |
| Monday | 11:00 am - 2:00 am |
| Tuesday | 11:00 am - 2:00 am |
| Wednesday | 11:00 am - 2:00 am |
| Thursday | 11:00 am - 2:00 am |
| Friday | 11:00 am - 3:00 am |
| Saturday | 11:00 am - 3:00 am |
Restaurant info
Born in the heart of Chinatown, K.O. Burger specializes in a special beef blend, smashed thin for a lacy edge and toppings that pack a punch. We're not just swinging for the fences-every burger is a certified knockout, featuring in-house combinations where every ingredient is designed to work in tandem on a toasted Martin’s Potato Roll. From light to heavyweight contenders, our menu is built for every weight class. Step up and ring the bell, KO Burger welcomes you to the club.
Location
© 2026 Toast, Inc.
Made with 
in Boston
in Boston
