In-N-Out Burger Animal Style Copycat

Welcome to my kitchen! Today, we’re diving into a beloved classic that has captivated taste buds for generations: the In-N-Out Burger Animal Style Copycat. Forget the long queues and the plane ticket; I’m going to show you how to recreate that iconic, mouth-watering experience right in your own home with a recipe I’ve perfected over countless attempts. I stumbled upon this combination by accident one evening, trying to replicate a fond memory, and it’s been a hit with everyone who’s tried it ever since.

Recipe Overview

• Prep Time: 25 minutes
• Cook Time: 30 minutes
• Total Time: 55 minutes
• Servings: 4 burgers
• Difficulty: Moderate

Why You’ll Love This In-N-Out Burger Animal Style Copycat

• It perfectly captures the unique flavour profile of the original, from the tangy sauce to the caramelised onions.
• You get to enjoy a restaurant-quality burger without leaving the comfort of your home kitchen.
• Customise every element to your exact preference, ensuring each bite is just how you like it.
• It’s a fantastic way to impress friends and family with a truly special meal.
• Using fresh ingredients means a more wholesome and satisfying experience every time.

In-N-Out Burger Animal Style Copycat

25 min prep  ·  30 min cook  ·  4 servings

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Ingredients You’ll Need

• 450g lean ground beef (approximately 80/20 fat ratio for best flavour)
• 4 burger buns, preferably brioche or potato buns
• 4 slices mature cheddar cheese
• 2 large white onions, finely diced (for sauce) and thinly sliced (for burgers)
• 2 tbsp neutral oil (like vegetable or rapeseed oil)
• 150g mayonnaise
• 60g tomato ketchup
• 1 tbsp English mustard
• 1 tbsp white vinegar
• 1 tsp granulated sugar
• 1/2 tsp garlic powder
• 1/4 tsp cayenne pepper (optional, for a subtle kick)
• 4 large lettuce leaves, shredded
• 2 large tomatoes, thinly sliced
• Salt and freshly ground black pepper to taste

Tip: Opt for fresh, good-quality ingredients. The better your foundation, the more exceptional your final burger will be. Don’t skimp on the beef – a good fat ratio makes all the difference to the juiciness and flavour of your patties.

How to Make In-N-Out Burger Animal Style Copycat

1. Prepare the Animal Style Sauce: In a medium bowl, combine the mayonnaise, tomato ketchup, English mustard, white vinegar, granulated sugar, garlic powder, and cayenne pepper (if using). Stir everything together thoroughly until the sauce is smooth and a uniform peachy-orange colour. Cover the bowl and refrigerate for at least 15 minutes to allow the flavours to meld, creating a more cohesive taste.
2. Caramelise the Onions: Heat 1 tablespoon of neutral oil in a large frying pan or skillet over medium-low heat. Add the finely diced white onions to the pan. Cook slowly, stirring occasionally, for 15-20 minutes until the onions turn a rich, deep golden-brown colour and are incredibly soft and sweet, releasing a wonderfully fragrant, sweet aroma. This slow caramelisation is key to their deep flavour. Once done, remove from the pan and set aside.
3. Form and Season the Patties: Divide the ground beef into four equal portions. Gently form each portion into a thin patty, slightly wider than your burger buns, as they will shrink during cooking. Create a slight indentation in the centre of each patty with your thumb to prevent them from puffing up. Season both sides generously with salt and freshly ground black pepper.
4. Cook the Patties: Heat the remaining 1 tablespoon of neutral oil in the same frying pan or skillet over medium-high heat until it shimmers. Place the patties in the hot pan, ensuring not to overcrowd it (cook in batches if necessary). Cook for 3-4 minutes per side for a medium doneness. You’ll hear a satisfying sizzle, and the patties will develop a lovely browned crust. In the last minute of cooking, place a slice of mature cheddar cheese on top of each patty, allowing it to melt and become gloriously gooey.
5. Toast the Buns: While the patties are cooking, lightly toast your burger buns. You can do this in a dry pan, on a griddle, or under the grill until they are lightly golden and slightly crispy to the touch, releasing a warm, comforting smell of baked bread. This prevents them from getting soggy and adds texture.
6. Assemble Your Burgers: Spread a generous amount of the prepared Animal Style sauce on both the top and bottom halves of each toasted bun. On the bottom bun, layer shredded lettuce, sliced tomatoes, then a cheesy patty. Top the patty with a spoonful of the sweet, caramelised onions. Finish with the top bun, pressing down gently. You’ll see a beautiful stack of vibrant colours and textures, ready to be devoured!

Tips From My Kitchen

• Don’t Overwork the Meat: When forming your burger patties, handle the ground beef as little as possible. Overworking the meat can make the burgers tough and dense. We want a tender, juicy patty, so a light touch is essential. This allows the fat to render properly during cooking, keeping the burger moist and flavourful.
• Chill the Sauce: While it might seem like an extra step, allowing the Animal Style sauce to chill in the fridge for at least 15 minutes (or even longer) makes a significant difference. The cooling period allows all the different flavours – the tang from the vinegar, the sweetness from the sugar, the richness of the mayo – to fully meld together, creating a more harmonious and pronounced taste that truly captures the essence of the original.
• Master the Caramelised Onions: Patience is key when caramelising onions. Don’t rush the process by turning up the heat too high. Cooking them slowly over a medium-low heat for 15-20 minutes allows their natural sugars to develop and brown, transforming them into incredibly sweet, sticky, and deeply savoury morsels. If you cook them too fast, they’ll burn or remain raw, missing that crucial flavour depth.
• The Indentation Trick: Always create a small dimple or indentation in the centre of each burger patty before cooking. As ground beef cooks, the proteins contract, causing the patty to puff up in the middle, leaving you with a domed burger and uneven cooking. The indentation helps the patty cook flat, ensuring a perfectly shaped burger that fits beautifully in your bun and cooks evenly throughout.
• Toast Your Buns Properly: A well-toasted bun is often overlooked but is crucial for a great burger experience. Toasting creates a barrier that prevents the bun from becoming soggy from the sauce and burger juices. It also adds a delightful textural contrast and a subtle nutty flavour. Just a minute or two in a dry pan or under the grill is all it takes to elevate your burger. I make this at least once a week – it’s become a family favourite, and these tips are how I get it right every time.
• Use a Hot Pan for Patties: Ensure your frying pan is properly heated before adding the burger patties. A hot pan creates a fantastic sear on the outside of the patty, locking in juices and developing a delicious crust known as the Maillard reaction. If the pan isn’t hot enough, the meat will steam rather than sear, resulting in a less flavourful and appealing burger.

Common Mistakes to Avoid

• Overcrowding the pan: When cooking the burger patties or caramelising onions, resist the urge to cram too many into the pan at once. Overcrowding lowers the pan’s temperature, causing the ingredients to steam instead of searing or caramelising. This leads to pale, flabby burgers and onions that are mushy rather than beautifully browned and sweet. Cook in batches if necessary to ensure each element gets proper contact with the heat.
• Wrong temperature: Cooking at the wrong temperature can ruin your burger. For the caramelised onions, a medium-low heat (around 120-130°C / 250-265°F) is essential for slow, even browning without burning. For the burger patties, a medium-high heat (around 190-200°C / 375-390°F) is ideal to achieve that perfect crust while keeping the interior juicy. Too low, and they’ll be grey; too high, and they’ll burn before cooking through.
• Skipping the rest time: While not strictly a rest time for the burger patties (as they’re usually eaten immediately), ensuring your sauce has time to chill and the onions are properly caramelised are crucial “rest” or “slow cook” steps. For the sauce, allowing it to sit allows the flavours to deepen and blend. For the onions, the slow cooking is their “rest” where the sugars slowly develop. Skipping these foundational steps will result in a less flavourful and cohesive burger experience.

Delicious Variations to Try

• Spicy Version: For those who love a bit of heat, you can easily turn up the spice factor. Increase the amount of cayenne pepper in the Animal Style sauce, or add a pinch of chilli flakes. For an extra kick, finely dice some jalapeños and mix them into the caramelised onions as they cook, or add a slice of pepper jack cheese to your patty.
• Vegetarian/Vegan Option: This copycat can easily be adapted for plant-based diets. Substitute the ground beef with your favourite plant-based burger patties. For the cheese, use a dairy-free mature cheddar alternative. For the sauce, swap regular mayonnaise for a good quality vegan mayonnaise, and ensure your buns are dairy-free.
• Different Protein: While beef is traditional, you can experiment with other proteins. Ground chicken or turkey can make for a lighter alternative. Just ensure you adjust cooking times as poultry cooks faster and has less fat, so be careful not to overcook. You could also try these flavours with a grilled portobello mushroom for a delightful change.

What to Serve With In-N-Out Burger Animal Style Copycat

• Crispy French fries or sweet potato fries
• A fresh garden salad with a light vinaigrette
• Homemade onion rings
• Coleslaw with a creamy dressing

Frequently Asked Questions

In-N-Out Burger Animal Style Copycat

A beloved copycat recipe for the iconic In-N-Out Burger Animal Style, featuring juicy beef patties, melted cheddar, sweet caramelized onions, crisp lettuce, fresh tomatoes, and a tangy, secret Animal Style sauce, all nestled in toasted buns.

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Prep Time 25 minutes mins

Cook Time 30 minutes mins

Total Time 55 minutes mins

Servings: 4 servings

Course: Main Course

Cuisine: American

Calories: 350

Ingredients Method Notes

Ingredients

  

• 450 g lean ground beef approximately 80/20 fat ratio for best flavour
• 4 burger buns preferably brioche or potato buns
• 4 slices mature cheddar cheese
• 2 large white onions finely diced (for sauce) and thinly sliced (for burgers)
• 2 tbsp neutral oil like vegetable or rapeseed oil
• 150 g mayonnaise
• 60 g tomato ketchup
• 1 tbsp English mustard
• 1 tbsp white vinegar
• 1 tsp granulated sugar
• 1/2 tsp garlic powder
• 1/4 tsp cayenne pepper optional, for a subtle kick
• 4 large lettuce leaves shredded
• 2 large tomatoes thinly sliced
• Salt and freshly ground black pepper to taste

Method

 

1. Prepare the Animal Style Sauce: In a medium bowl, combine the mayonnaise, tomato ketchup, English mustard, white vinegar, granulated sugar, garlic powder, and cayenne pepper (if using). Stir everything together thoroughly until the sauce is smooth and a uniform peachy-orange colour. Cover the bowl and refrigerate for at least 15 minutes to allow the flavours to meld, creating a more cohesive taste.
2. Caramelise the Onions: Heat 1 tablespoon of neutral oil in a large frying pan or skillet over medium-low heat. Add the finely diced white onions to the pan. Cook slowly, stirring occasionally, for 15-20 minutes until the onions turn a rich, deep golden-brown colour and are incredibly soft and sweet, releasing a wonderfully fragrant, sweet aroma. This slow caramelisation is key to their deep flavour. Once done, remove from the pan and set aside.
3. Form and Season the Patties: Divide the ground beef into four equal portions. Gently form each portion into a thin patty, slightly wider than your burger buns, as they will shrink during cooking. Create a slight indentation in the centre of each patty with your thumb to prevent them from puffing up. Season both sides generously with salt and freshly ground black pepper.
4. Cook the Patties: Heat the remaining 1 tablespoon of neutral oil in the same frying pan or skillet over medium-high heat until it shimmers. Place the patties in the hot pan, ensuring not to overcrowd it (cook in batches if necessary). Cook for 3-4 minutes per side for a medium doneness. You'll hear a satisfying sizzle, and the patties will develop a lovely browned crust. In the last minute of cooking, place a slice of mature cheddar cheese on top of each patty, allowing it to melt and become gloriously gooey.
5. Toast the Buns: While the patties are cooking, lightly toast your burger buns. You can do this in a dry pan, on a griddle, or under the grill until they are lightly golden and slightly crispy to the touch, releasing a warm, comforting smell of baked bread. This prevents them from getting soggy and adds texture.
6. Assemble Your Burgers: Spread a generous amount of the prepared Animal Style sauce on both the top and bottom halves of each toasted bun. On the bottom bun, layer shredded lettuce, sliced tomatoes, then a cheesy patty. Top the patty with a spoonful of the sweet, caramelised onions. Finish with the top bun, pressing down gently. You'll see a beautiful stack of vibrant colours and textures, ready to be devoured!

Notes

For the best results, don't rush the caramelisation of the onions or the chilling of the Animal Style sauce. These steps are crucial for developing the deep, rich flavors characteristic of the In-N-Out Animal Style burger.

And there you have it – your very own In-N-Out Burger Animal Style Copycat, ready to rival any takeaway! This recipe is more than just a meal; it’s an experience, a little slice of culinary joy brought right into your home. I truly hope you enjoy making and devouring these as much as my family and I do. Don’t forget to share your cooking adventures in the comments below – I always love hearing from you!