About Flat Out - Smash Burgers - Royal Docks
Expertly smashed, just for you. Your Flat Out journey begins at the iconic crispy edge of our patties, taking you on a tantalising trip to a juicy centre. We keep the toppings simple, delicious and customisable for you. We use quality certified British & Irish beef that's sourced carefully to halal standards - because we believe everyone should be able to enjoy our proper smashed burgers. Choose between one, two, three, four and even TEN patties - how high will you go?
Buy 1, get 1 free
Add 2 of the same item to your basket for the price of one – T&Cs apply. New customers only.
Double Cheeseburger
Currently sold out£8.90PopularBuy 1, get 1 free
Meal Deals 🤑
Fun, love & burgers. Oh, and your choice of sides and drinks too.
The Flat Out Combo
Currently sold out£14.50PopularSingles Feast
Currently sold out£17.00The Flat Out Feast
Currently sold out£28.90
Christmas Special 🎄
Celebrate the holidays with our limited-edition Christmas Special!
Smashed Camembert Burger
Currently sold out£11.90
Special Burgers 🍂
Try our two special smash burgers: expertly crafted, bold, and delicious—here for a limited time only!
BBQ Onion Burger
Two juicy smash patties layered with smoky cheddar and American cheese, with delicate, thinly sliced onions tucked between the patties for a burst of fresh flavor. Topped with crispy fried onions, BBQ sauce, our signature house sauce, and crisp lettuce—all nestled in a perfectly toasted bun.£10.50PopularSpicy Jalapeño Burger
Currently sold out£10.50
Classic Burgers 🍔
Burgers that are smashed for flavour and texture. How high will you go?
Double Cheeseburger
Currently sold out£8.90Buy 1, get 1 freeTriple Cheeseburger
Currently sold out£11.90PopularSingle Cheeseburger
Currently sold out£6.90Quadruple Cheeseburger
Currently sold out£14.90
Vegan Burgers 🌱
Savor the flavor-packed delight of our Vegan Smash Burger, a plant-based patty cooked to perfection and bursting with taste in every bite.
Vegan Double Cheeseburger 🌱
Currently sold out£9.90Vegan Triple Cheeseburger 🌱
Currently sold out£12.90
THE FLAT OUT CHALLENGE 💪
A burger to end all burgers. Post a before & after shot on your Instagram story, tag @flatoutburgersuk, and you'll receive £10 off your next order. That's a pound for every patty! Do you have what it takes?
Ten Patty Cheeseburger Challenge
Currently sold out£29.90
Sides 🍟
Beige but beautiful.
House Waffle Fries
Death to soggy chips. Long live crispy waffle fries - lightly seasoned with salt because that's all you need.£3.90Hot Waffle Fries
Dusted in our house seasoning to give you that kick you're craving when you're going flat out.£3.90Hot Tater Tots
Tater tots tossed in our house seasoning.Top tip: best enjoyed dunked in our ranch or house sauce.£3.90Gooey Mac & Cheese Bites
Bites of macaroni pasta - crumbed & coated in our original seasoning and oozing with mature cheddar cheese inside. Naughty.£4.50House Tater Tots
Pure nostalgia. Like hash browns, but so much better.£3.90Cheeseburger Waffle Fries
Our iconic waffle fries topped with smashed crispy pieces of beef, melted cheese sauce, pickles and crispy onions. Peak indulgence.£9.00PopularHot 'n' Gooey Mac & Cheese Bites
Currently sold out£4.50
Sauces & Dips 🍅
Dunk away.
Cajun Ranch Sauce
House-made, smoky, creamy and blackened with cajun seasoning. A Flat Out team favourite.£0.90House Sauce
Our secret house sauce. It's creamy. It's tangy. It's addictive.£0.90Ketchup
Heinz. Say no more.£0.90
Drinks 🥤
The classics only.
Coke Zero
The OG minus the sugar.£2.25Coke
The OG.£2.25Rubicon Mango
Rich in vitamin C, apparently.£2.25Sprite
Fun fact: our lowest selling drink. Show it some love.£2.25Fanta Orange
Fizzy orange for that juicy fix.£2.25
Dessert 🍦
Finish on something sweet.
Churros
Caramel-filled churros with a rich chocolate dipping sauce. A perfect, sweet finishing touch!£4.90
