The Coziest Copycat In-N-Out Double-Double Burger
There are some weekends that simply beg for a project; a slow, deliberate, comforting undertaking that fills the house with the promise of something truly satisfying. For me, that project is often a burger, but not just any burger—it’s the one I’ve been making for over seven years, a copycat of the legendary In-N-Out Double-Double, done Animal Style. It’s a ritual that begins with the sharp scent of onions hitting hot oil and ends with that first, glorious bite, and I’m about to walk you through every single step.
Recipe Overview
- Prep Time: 20 minutes
- Cook Time: 25 minutes
- Total Time: 45 minutes
- Servings: 4 hearty burgers
- Difficulty: Medium
Why You’ll Love This Copycat In-N-Out Double-Double Burger (Animal Style)
- Unrivalled Savoury Depth: The double patties, seared to a crisp edge and topped with melted cheese, create a texture and flavour that a single patty simply cannot match.
- The Magic of Caramelised Onions: Those slow-cooked, sweet, and jammy onions are the heart of the Animal Style experience, adding a rich, complex sweetness that balances the savoury beef.
- A Tangy, Addictive Sauce: The secret sauce—creamy, tangy, with a hint of pickle—ties everything together in a way that makes every single bite as good as the last.
- A Satisfying Weekend Project: This isn’t a rushed weeknight dinner; it’s a chance to slow down, enjoy the process, and fill your kitchen with incredible aromas, from sizzling beef to toasted buns.
- Better Than Takeaway: You control the quality of every ingredient, from the freshly minced beef to the perfectly toasted bun, resulting in a burger that is genuinely superior to any fast-food version.
Ingredients You’ll Need
- 750g beef mince (20% fat content is ideal for juicy burgers)
- 4 soft burger buns (brioche or potato rolls work brilliantly)
- 8 slices of American cheese (or a good melting cheddar)
- 2 large white onions, finely diced
- 4 tablespoons unsalted butter
- 4 large leaves of iceberg lettuce
- 4 slices of ripe tomato
- 4 tablespoons dill pickle slices
- For the Animal Style Sauce: 6 tablespoons mayonnaise
- 2 tablespoons tomato ketchup
- 1 tablespoon American yellow mustard
- 1 tablespoon sweet pickle relish
- 1 teaspoon white wine vinegar
- ½ teaspoon smoked paprika
- ¼ teaspoon garlic powder
- Salt and freshly ground black pepper
Tip: For the best flavour, use beef mince with a higher fat content—around 20%. It renders down during cooking, keeping the patties incredibly moist and adding a deep, beefy flavour that leaner mince just can’t provide.
How to Make Copycat In-N-Out Double-Double Burger (Animal Style)
- Start the Animal Style Onions: Melt 2 tablespoons of butter in a large frying pan over a medium heat. Add the finely diced onions and a generous pinch of salt. Cook, stirring occasionally, for 15-20 minutes. You’re looking for them to turn a deep, golden brown and become soft and jammy. The sound will change from a loud sizzle to a gentle, buttery hiss, and the smell will become incredibly sweet and savoury.
- Make the Secret Sauce: While the onions are caramelising, whisk together the mayonnaise, ketchup, mustard, pickle relish, white wine vinegar, smoked paprika, and garlic powder in a small bowl. Set aside. The colour should be a pale, peachy pink, and the aroma will be tangy and slightly smoky.
- Prepare the Patties: Divide the beef mince into 8 equal portions. Roll each into a ball, then flatten into a thin patty, slightly larger than your buns (they will shrink during cooking). Season both sides very generously with salt and pepper. The patties should feel cool and firm to the touch.
- Toast the Buns: In a clean, dry frying pan (or on a griddle) over a medium-high heat, split your buns and place them cut-side down. Toast for about 1-2 minutes until they are golden brown and smell wonderfully nutty. The visual cue is a deep, even tan on the cut surface.
- Cook the Patties: Increase the heat under your large frying pan to high. Add the remaining 2 tablespoons of butter. Once it’s foaming and sizzling loudly, carefully place 4 patties in the pan. Cook for 2 minutes without moving them. You’ll see the edges turn a deep brown and the juices start to bubble on the surface. Flip them, immediately place a slice of cheese on two of the patties, and cook for another 1-2 minutes for a medium doneness. The cheese should be melting and soft.
- Assemble the ‘Animal Style’ Base: On the bottom half of each toasted bun, spread a generous tablespoon of the secret sauce. Top with a slice of tomato and a handful of the caramelised onions. Place the cheese-topped patty on the onions.
- Stack the Second Patty: Place a second, cheese-less patty directly on top of the first. Add another spoonful of the caramelised onions and a few pickle slices. The heat from the patties will warm the onions and pickles perfectly.
- Finish and Serve: Place a piece of iceberg lettuce on top of the second patty. Spread another spoonful of sauce on the top bun half, then place it on the lettuce. Press down gently to meld the flavours. The burger should feel warm and heavy in your hands, the bun soft, and the patties firm. Serve immediately.
Tips From My Kitchen
- Don’t Overwork the Mince: The key to a tender patty is gentle handling. Over-mixing or pressing the mince too firmly will result in a dense, tough burger. Just roll it into a ball and flatten it gently. The texture should be light and slightly crumbly before it hits the pan.
- Use a Hot, Hot Pan: For that perfect, caramelised crust, your pan must be screaming hot before you add the patties. A good test is to flick a drop of water onto the surface; it should evaporate instantly. The sound of the patties hitting the pan should be a loud, aggressive sizzle, not a gentle hiss.
- Season Just Before Cooking: Salt draws moisture out of the meat. If you season your patties too early, they will become wet and won’t sear properly. Season them generously right before they go into the hot pan. You’ll see the salt begin to dissolve on the surface, a sign that it’s ready for the heat.
- Resist the Urge to Press: Never, ever press down on your patties with a spatula while they are cooking. You are squeezing out all the delicious, flavourful juices that make the burger moist. The patties will naturally puff up slightly; this is a good sign. Let them be.
- Let Them Rest: Just like a good steak, your cooked patties need a brief rest of about 2 minutes before you assemble the burger. This allows the juices to redistribute throughout the meat, ensuring the first bite is juicy, not a flood on your plate. The patties will feel firmer to the touch after resting.
Equipment You’ll Need
- Large frying pan or skillet (non-stick or cast iron)
- Sharp knife and cutting board
- Mixing bowls (one for sauce, one for the beef)
- Wooden spoon or spatula for stirring onions
- Metal spatula for flipping burgers
Delicious Variations to Try
- Spicy Version: Add a finely chopped jalapeño to the caramelising onions, or stir a teaspoon of your favourite hot sauce into the secret sauce for a fiery kick that cuts through the richness.
- Vegetarian/Vegan Option: Use two good-quality plant-based patties per burger. Ensure they are well-seasoned and cooked in a little oil until crispy on the outside. Use a vegan cheddar-style cheese and a plant-based mayonnaise for the sauce.
- Different Protein: For a lighter take, substitute the beef patties with well-seasoned turkey or chicken mince. Cook them through completely, and consider adding a slice of provolone or Swiss cheese for a different flavour profile.
What to Serve With Copycat In-N-Out Double-Double Burger (Animal Style)
- Crispy Sweet Potato Fries Recipe – the natural sweetness is a brilliant foil for the savoury, tangy burger.
- A simple, crisp green salad with a sharp vinaigrette to cut through the richness.
- Extra pickles and a side of the secret sauce for dipping your Crispy Philly Cheesesteak Egg Rolls if you’re feeling particularly indulgent.
Still hungry for ideas? You might also love In N Out Burger Animal Style Copycat, Five Guys Burger Cajun Fries Copycat from our sister kitchens.
Frequently Asked Questions
Can I use a different type of cheese?
Absolutely. While American cheese is the classic choice for its superior melting properties and creamy texture, a good melting cheddar, Monterey Jack, or even a slice of provolone will work beautifully. The key is to choose a cheese that melts smoothly and won’t become oily.
How do I get the onions perfectly caramelised?
Patience is your greatest tool here. Cook them low and slow over a medium heat, and don’t be tempted to rush them. A pinch of salt helps draw out the moisture, and a splash of water or beef stock if they start to stick will deglaze the pan and keep them moist. They are ready when they are a deep, sticky, golden brown.
Can I make the patties ahead of time?
Yes, you can form the patties up to 24 hours in advance. Place them on a baking sheet lined with baking paper, cover them with cling film, and store them in the refrigerator. Just be sure to take them out of the fridge 15 minutes before cooking to allow them to come to room temperature slightly, which helps them cook more evenly.
What is the best way to toast the buns?
A hot, dry frying pan or griddle is the best method. It gives you a wonderfully even, golden-brown toast with a slightly crisp edge, without making the bun soggy. You can also toast them under the grill, but watch them closely as they can burn quickly.
How do I store leftover cooked patties?
Store any leftover cooked patties in an airtight container in the refrigerator for up to 3 days. To reheat, place them in a frying pan over a medium heat with a splash of water, cover with a lid, and steam for a minute or two. This will help them retain moisture without drying them out.
Copycat In-N-Out Double-Double Burger (Animal Style)
A homemade version of the iconic In-N-Out Double-Double, made Animal Style with caramelized onions, secret sauce, and two juicy beef patties.
Ingredients
Method
- Start the Animal Style Onions: Melt 2 tablespoons of butter in a large frying pan over a medium heat. Add the finely diced onions and a generous pinch of salt. Cook, stirring occasionally, for 15-20 minutes. You're looking for them to turn a deep, golden brown and become soft and jammy. The sound will change from a loud sizzle to a gentle, buttery hiss, and the smell will become incredibly sweet and savoury.
- Make the Secret Sauce: While the onions are caramelising, whisk together the mayonnaise, ketchup, mustard, pickle relish, white wine vinegar, smoked paprika, and garlic powder in a small bowl. Set aside. The colour should be a pale, peachy pink, and the aroma will be tangy and slightly smoky.
- Prepare the Patties: Divide the beef mince into 8 equal portions. Roll each into a ball, then flatten into a thin patty, slightly larger than your buns (they will shrink during cooking). Season both sides very generously with salt and pepper. The patties should feel cool and firm to the touch.
- Toast the Buns: In a clean, dry frying pan (or on a griddle) over a medium-high heat, split your buns and place them cut-side down. Toast for about 1-2 minutes until they are golden brown and smell wonderfully nutty. The visual cue is a deep, even tan on the cut surface.
- Cook the Patties: Increase the heat under your large frying pan to high. Add the remaining 2 tablespoons of butter. Once it's foaming and sizzling loudly, carefully place 4 patties in the pan. Cook for 2 minutes without moving them. You'll see the edges turn a deep brown and the juices start to bubble on the surface. Flip them, immediately place a slice of cheese on two of the patties, and cook for another 1-2 minutes for a medium doneness. The cheese should be melting and soft.
- Assemble the 'Animal Style' Base: On the bottom half of each toasted bun, spread a generous tablespoon of the secret sauce. Top with a slice of tomato and a handful of the caramelised onions. Place the cheese-topped patty on the onions.
- Stack the Second Patty: Place a second, cheese-less patty directly on top of the first. Add another spoonful of the caramelised onions and a few pickle slices. The heat from the patties will warm the onions and pickles perfectly.
- Finish and Serve: Place a piece of iceberg lettuce on top of the second patty. Spread another spoonful of sauce on the top bun half, then place it on the lettuce. Press down gently to meld the flavours. The burger should feel warm and heavy in your hands, the bun soft, and the patties firm. Serve immediately.
Notes
Use 20% fat beef mince for the juiciest patties. American cheese melts best, but a good melting cheddar works too.
I make this at least once a week – it’s become a family favourite that never fails to bring smiles around the table. There’s a profound satisfaction in building this burger from scratch, in mastering the caramelisation of the onions, and in that first, perfect bite where all the textures and flavours come together. It’s more than just a meal; it’s a small, delicious victory for your weekend self. I’d love to hear how your own burger project turns out, so please do share your experience in the comments below.
