About Flat Out Slam Burger
Expertly smashed. Seriously juicy. Welcome to Flat Out Smash Burgers – where every bite starts with that legendary crispy edge and sinks into a melt-in-your-mouth, juicy centre. We keep it real with simple, irresistible toppings and give you the power to build your perfect burger. 🔥 Made with 100% quality-certified British & Irish beef ✅ Halal-friendly, so everyone can enjoy 🍔 Pick your stack: 1, 2, 3, 4… even 10 patties. How high will you go? Crispy, juicy, unforgettable – this is the smash burger you’ve been craving.
20% off selected items
Get 20% off selected items – T&Cs apply
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.£8.40£10.50Halal20% offCheeseburger Waffle Fries
Our iconic waffle fries topped with smashed crispy pieces of beef, melted cheese sauce, pickles and crispy onions. Peak indulgence.£7.20£9.0020% offChurros
Caramel-filled churros with a rich chocolate dipping sauce. A perfect, sweet finishing touch!£3.92£4.9020% offDouble Cheeseburger
The champ: two mighty crispy smashed patties, three slices of melted American cheese, diced onions, gherkins and your choice of our house sauce or classic ketchup & mustard. Halal friendly, Morden SM4 staple.£7.12£8.90Popular20% offHot 'n' Gooey Mac & Cheese Bites
Bites of macaroni pasta - crumbed & coated in our HOT seasoning and oozing with mature cheddar cheese inside. Do yourself a favour and dunk these in some of our ranch or house sauce.£3.60£4.5020% offHot Tater Tots
Tater tots tossed in our house seasoning.Top tip: best enjoyed dunked in our ranch or house sauce.£3.12£3.9020% offHot Waffle Fries
Dusted in our house seasoning to give you that kick you're craving when you're going flat out.£3.12£3.9020% offHouse Tater Tots
Pure nostalgia. Like hash browns, but so much better.£3.12£3.9020% offHouse Waffle Fries
Death to soggy chips. Long live crispy waffle fries - lightly seasoned with salt because that's all you need.£3.12£3.9020% offPepe Burger
Two crispy tenders, melted American cheese, chill crunchy slaw and our signature blackened ranch. Feeling fancy? Pickles on the house. Iconic in Morden SM4.£6.79£8.49Popular20% offQuadruple Cheeseburger
The quad: four mighty smashed patties, five slices of melted American cheese, diced onions, gherkins and your choice of sauce. For those who want it all. Halal-friendly.£11.12£13.90Halal20% offRubicon Mango
Rich in vitamin C, apparently.£1.80£2.2520% offSingle Cheeseburger
The underdog never to be underestimated: one crispy smashed patty, two slices of melted American cheese, diced onions, gherkins and your choice of sauce. Halal-friendly.£6.32£7.90Popular20% offSingles Feast
A mouth-watering smashed burger with your choice of side, drink and caramel-filled churros with rich chocolate dipping sauce. The perfect solo burger feast in Morden SM4.£13.60£17.00Halal20% offSpicy Jalapeño Burger
Two juicy smash patties layered with smoky cheddar and melty American cheese, topped with a kick of chilli jam, fiery jalapeños, crispy lettuce, and our signature house burger sauce, all packed into a soft, toasted bun. Bold, spicy, and irresistibly good! Highly rated.£8.40£10.50Halal20% offTen Patty Cheeseburger Challenge
Ten mighty fine crispy smashed patties & eleven slices of gooey American cheese* in this ultimate burger challenge. *with diced onions, gherkins and your choice of house sauce or ketchup and mustard too.£23.92£29.90Halal20% offThe Flat Out Combo
Double juicy halal-beef smash patties with melted cheese on a toasted bun, served with your choice of crispy waffle fries and a chilled drink. Morden’s smash burger favourite in SM4.£11.99£14.99Popular20% offThe Flat Out Feast
For those who live bold: our classic double cheeseburger plus two sides and two drinks. Morden SM4’s big burger belter.£23.92£29.90Halal20% offTriple Cheeseburger
Highly rated· The three-peat: three crushed patties with four slices of melted American cheese, diced onions, gherkins and sauce of your choice. Halal-friendly, ideal for serious burger lovers.£7.92£9.90Halal20% offTruffle Burger
A smash burger loaded with rich truffle cream, golden crispy onions and caramelised onion, finished with melted cheese and a toasted bun. Bold, indulgent and Halal friendly.£7.99£9.99Popular20% off
Popular with other people
Gooey Mac & Cheese Bites
£4.50Coke
£2.25Fanta Orange
£2.25Coke Zero
£2.25Vegan Double Cheeseburger 🌱
£13.90Sprite
£2.25
Meal Deals 🤑
Fun, love & burgers. Oh, and your choice of sides and drinks too.
The Flat Out Combo
Double juicy halal-beef smash patties with melted cheese on a toasted bun, served with your choice of crispy waffle fries and a chilled drink. Morden’s smash burger favourite in SM4.£11.99£14.9920% offSingles Feast
A mouth-watering smashed burger with your choice of side, drink and caramel-filled churros with rich chocolate dipping sauce. The perfect solo burger feast in Morden SM4.£13.60£17.0020% offThe Flat Out Feast
For those who live bold: our classic double cheeseburger plus two sides and two drinks. Morden SM4’s big burger belter.£23.92£29.9020% off
New Burger ✨
Try our brand new burger!
Truffle Burger
A smash burger loaded with rich truffle cream, golden crispy onions and caramelised onion, finished with melted cheese and a toasted bun. Bold, indulgent and Halal friendly.£7.99£9.9920% offPepe Burger
Two crispy tenders, melted American cheese, chill crunchy slaw and our signature blackened ranch. Feeling fancy? Pickles on the house. Iconic in Morden SM4.£6.79£8.4920% off
Special Burgers 🍂
Try our two special smash burgers: expertly crafted, bold, and delicious—here for a limited time only!
Spicy Jalapeño Burger
Two juicy smash patties layered with smoky cheddar and melty American cheese, topped with a kick of chilli jam, fiery jalapeños, crispy lettuce, and our signature house burger sauce, all packed into a soft, toasted bun. Bold, spicy, and irresistibly good! Highly rated.£8.40£10.5020% offBBQ 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.£8.40£10.5020% off
Classic Burgers 🍔
Burgers that are smashed for flavour and texture. How high will you go?
Double Cheeseburger
The champ: two mighty crispy smashed patties, three slices of melted American cheese, diced onions, gherkins and your choice of our house sauce or classic ketchup & mustard. Halal friendly, Morden SM4 staple.£7.12£8.9020% offSingle Cheeseburger
The underdog never to be underestimated: one crispy smashed patty, two slices of melted American cheese, diced onions, gherkins and your choice of sauce. Halal-friendly.£6.32£7.9020% offTriple Cheeseburger
Highly rated· The three-peat: three crushed patties with four slices of melted American cheese, diced onions, gherkins and sauce of your choice. Halal-friendly, ideal for serious burger lovers.£7.92£9.9020% offQuadruple Cheeseburger
The quad: four mighty smashed patties, five slices of melted American cheese, diced onions, gherkins and your choice of sauce. For those who want it all. Halal-friendly.£11.12£13.9020% off
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.
Vegan Double Cheeseburger 🌱
Indulge in our Vegan Double Smash Burger, a plant-based delight that doesn't compromise on flavor. Featuring two perfectly seasoned, crispy-edged vegan patties, topped with refreshing pickles, crunchy onions and a tangy vegan special sauce. All this goodness is sandwiched between a toasted, soft vegan bun.£13.90Vegan
The Flat Out Challenge 💪
A burger to end all burgers.
Ten Patty Cheeseburger Challenge
Ten mighty fine crispy smashed patties & eleven slices of gooey American cheese* in this ultimate burger challenge. *with diced onions, gherkins and your choice of house sauce or ketchup and mustard too.£23.92£29.9020% off
Sides 🍟
Beige but beautiful.
House Tater Tots
Pure nostalgia. Like hash browns, but so much better.£3.12£3.9020% offGooey Mac & Cheese Bites
Bites of macaroni pasta - crumbed & coated in our original seasoning and oozing with mature cheddar cheese inside. Naughty.£4.50House Waffle Fries
Death to soggy chips. Long live crispy waffle fries - lightly seasoned with salt because that's all you need.£3.12£3.9020% offHot 'n' Gooey Mac & Cheese Bites
Bites of macaroni pasta - crumbed & coated in our HOT seasoning and oozing with mature cheddar cheese inside. Do yourself a favour and dunk these in some of our ranch or house sauce.£3.60£4.5020% offCheeseburger Waffle Fries
Our iconic waffle fries topped with smashed crispy pieces of beef, melted cheese sauce, pickles and crispy onions. Peak indulgence.£7.20£9.0020% offHot Tater Tots
Tater tots tossed in our house seasoning.Top tip: best enjoyed dunked in our ranch or house sauce.£3.12£3.9020% offHot Waffle Fries
Dusted in our house seasoning to give you that kick you're craving when you're going flat out.£3.12£3.9020% off
Sauces & Dips 🍅
Dunk away.
House Sauce
Our secret house sauce. It's creamy. It's Tangy. It's addictive.£0.90Ketchup
Heinz. Say no more.£0.90Mustard
£0.90
Drinks 🥤
The classics only.
Rubicon Mango
Rich in vitamin C, apparently.£1.80£2.2520% offCoke
The OG.£2.25Fanta Orange
Fizzy orange for that juicy fix.£2.25Coke Zero
The OG minus the sugar.£2.25Sprite
Fun fact: our lowest selling drink. Show it some love.£2.25
Dessert 🍦
Finish on something sweet.
Churros
Caramel-filled churros with a rich chocolate dipping sauce. A perfect, sweet finishing touch!£3.92£4.9020% off
