Animal Style Burger Recipe

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Animal Style is an In-N-Out copycat built around three specific techniques: mustard-grilled patties, slow-cooked caramelized onions, and a generous spread of Thousand Island-style sauce. You make it at home because the result is genuinely better than most burgers you can buy, and the whole thing comes together on one flat pan.

About the ingredients

Yellow mustard on the patty: Use plain yellow mustard — not Dijon, not spicy brown. You want that mild, vinegary tang that cooks into the crust without fighting the beef.
The spread: Store-bought Thousand Island dressing works fine as a base, but the homemade version in the recipe card is worth it. The ratio of sweet relish to mayo is what makes it taste right.
Onions: Sweet or yellow onions both work. White onions caramelize faster but can turn bitter if the heat is too high — yellow onions are more forgiving.
Beef: 80/20 ground chuck is the right call here. Leaner beef won’t give you enough fat to handle the mustard-sear without sticking.

Why this recipe works

Two things actually drive the flavor here. First, pressing mustard onto the raw patty face-down into a hot pan causes the mustard’s water to flash off almost instantly, leaving behind concentrated tangy compounds that bond directly into the sear — it’s not a coating you taste separately, it becomes part of the crust. Second, the caramelized onions do real work: their sweetness cuts through the richness of the beef and the fat in the spread, so the burger doesn’t feel heavy even with all those toppings stacked on it. Skip the egg in the mix — it makes the patty mushy and you lose that tight, snappy sear the mustard technique depends on.

If something goes sideways

Mustard burns before the patty is cooked through: Your pan is too hot. Medium-high is the ceiling for this technique. If the mustard side is scorching in under 60 seconds, pull the heat back before the flip.
Onions are still sharp and raw after 10 minutes: They need more time and a splash of water to unstick them. Keep the heat low, add a tablespoon of water, cover loosely, and give them another 10 minutes. Rushing this is the most common mistake.
Patty sticks when you try to flip it mustard-side down: The pan wasn’t hot enough when the patty went in. Let it preheat a full two minutes before the beef touches it, and don’t move the patty until it releases on its own.
Spread soaks through the bun before you’re done building: Toast the bun cut-side down in the same pan after the patty comes off. Thirty seconds is enough to create a barrier that holds up against the sauce.
Burger reads under 160°F at the center: Tent it loosely with foil in the pan off the heat for two minutes — carryover will usually close the gap without overcooking the crust.

In-N-Out–Style Hamburger, Animal Style

Jennifer McDonald

Inspired by California's beloved drive-thru icon, this Animal-Style homage captures the essentials: mustard-seared smash patties, jammy grilled onions, tangy-sweet spread, crisp lettuce, ripe tomato, melty American cheese, and briny pickle chips on a buttery toasted bun. It's a modern tribute to a mid-century classic-engineered for big flavor, perfect texture contrast, and joyful nostalgia at home.

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Prep Time 15

Cook Time 30

Total Time 45

Course Main Course

Cuisine American

Servings burgers

Calories 896 kcal

Ingredients

For the Griddled Caramelized Onions:

1 large yellow onion, finely chopped aim for small, even dice for faster, even caramelization
1 tbsp neutral oil canola or avocado oil
1 tbsp unsalted butter for richness and browning
¼ tsp kosher salt for the onions
½ tsp granulated sugar encourages caramelization
¼ cup water, plus more as needed for periodic deglazing to build fond

For the Animal-Style Spread:

⅓ cup mayonnaise Best Foods/Hellmann's recommended for classic flavor
2 tbsp ketchup Heinz preferred for balance and consistency
2 tbsp sweet pickle relish look for a relish with visible pickle texture, not pure9ed
1 tsp white vinegar brightness to cut richness
½ tsp granulated sugar balances acidity in the spread
¼ tsp paprika adds gentle warmth and color
¼ tsp onion powder round out savory notes

For the Buns & Toppings:

2 pieces soft burger buns enriched or potato buns for tenderness; non-sesame for classic style
1 tbsp unsalted butter, softened for toasting buns
4 slices ripe tomato slice ⅛ to ¼ inch thick; choose firm, juicy tomatoes
1 cup iceberg lettuce, finely shredded crisp, cold, and dry for best crunch
8 slices dill pickle chips classic crinkle-cut style recommended

For the Patties & Seasoning:

8 oz ground beef (80/20) chilled; freshly ground chuck for best flavor and lacy crusts
1 tsp kosher salt for seasoning patties to taste
½ tsp freshly ground black pepper for seasoning patties to taste
2 tbsp yellow mustard for mustard-frying the patties (signature Animal-Style)
2 slices American cheese deli-cut or good-quality packaged American for ideal melt

Instructions

Caramelize the Onions (about 20 minutes): Set a wide skillet or griddle over medium-low heat (surface around 275–300°F / 135–150°C). Add the oil and butter. When the butter foams, stir in the chopped onion, ¼ tsp kosher salt, and sugar. Cook, stirring every few minutes, until the onions turn deep golden and jammy, about 20 minutes. If the pan browns before the onions do, splash in a tablespoon of water to deglaze and fold the fond back into the onions. They’re ready when they’re soft, glossy, and smell sweet-savory.
Make the Animal-Style Spread (5 minutes): In a small bowl, whisk together mayonnaise, ketchup, sweet relish, white vinegar, sugar, paprika, and onion powder until smooth and rosy. Taste and adjust — a pinch more vinegar for brightness or relish for texture. Cover and refrigerate.
Prep Toppings (5 minutes): Slice the tomato, finely shred the iceberg, and pat both dry with paper towels for crisp texture. Set out pickle chips. Split the buns and lightly butter the cut sides.
Preheat the Cooking Surface: Warm a heavy skillet or flat-top over medium-high heat until very hot, about 3–6 minutes (target 400°F / 205°C at the surface). Turn on ventilation. While it heats, finish the onions if needed, then keep them warm on low.
Portion the Beef: Divide the 8 oz of ground beef into 4 equal balls (about 2 oz each). Keep them cold until the moment you sear. Do not pre-compress; loose-packed beef creates a lacy, crisp crust when smashed.
Toast the Buns (3–4 minutes): Place the buttered buns cut-side down on the hot surface and toast until golden and crisp at the edges, 3–4 minutes. Alternatively, toast on a sheet pan in a 350°F / 175°C oven for 3–4 minutes. Keep warm.
Smash and Mustard-fry the First Two Patties (about 3 minutes): Lightly oil the hot surface if needed. Add two beef balls, spaced well. Immediately press each ball under a stiff metal spatula (or a bacon press) through a small square of parchment to prevent sticking, flattening to about ⅛ inch. Season with kosher salt and black pepper. Cook without moving until the edges are deeply browned and the fat frizzles, 1½ to 2 minutes. Brush or squeeze about 1 tsp yellow mustard over the raw side of each patty, then flip directly onto the mustard. Top one patty with a slice of American cheese. Cook 45–60 seconds longer, just until the cheese melts and the mustard sizzles into the crust.
Repeat with the Remaining Patties (about 3 minutes): Cook the last two patties exactly as above, topping one of them with the second slice of cheese. You now have two cheese-topped patties and two plain patties — one stack per burger.
Assemble the Burgers (2 minutes): Spread about 1–1½ tbsp of Animal-Style spread on each bun half. On the bottom bun, layer pickles (4 per burger), tomato slices, and a fluffy pile of shredded lettuce. Add the cheese-topped patty, then the plain patty. Crown generously with the caramelized onions, then cap with the top bun. Press gently to set.
Serve: Serve immediately while the edges are crisp, the cheese is molten, and the bun is warm and fragrant.

Notes

Chef’s Tips:

Onion Speed-up: A tiny pinch (just a pinch) of baking soda accelerates browning; stir into the onions after 5 minutes. Don’t overdo it or they’ll taste soapy.
Mustard Control: Paint just enough mustard to coat the raw side; too much can scorch. A squeeze bottle gives the best control.
Cheese Melt: If the cheese resists melting, add a teaspoon of water to the pan and cover for 10–15 seconds to steam-melt.
Bun Choice: Enriched or potato buns deliver the soft, slightly sweet profile that balances the savory patties. Avoid overly crusty buns.
Beef Grind: 80/20 chuck is ideal. For extra flavor, blend in a little brisket or short rib.
Dietary Adaptations: Use gluten-free buns, or go “protein-style” with crisp lettuce leaves in place of buns. Swap in plant-based patties and vegan mayo/cheese for a vegetarian take.

Serving Suggestions:

Plate on warmed plates with a tumble of hot, crisp fries. For “true drive-in” vibes, wrap the burger in parchment for 1 minute to set, then unwrap halfway to reveal the glistening onions and rosy spread. Colors to look for: mahogany-brown onion sheen, tawny-golden bun, deep brown lacy edges on the patties, and bright lettuce-tomato contrast. Pair with a classic cola, a malty milkshake, or a crisp pilsner.

Culinary Context:

“Animal Style” hails from In-N-Out’s Southern California lore — mustard-fried patties, extra spread, pickles, and grilled onions. This at-home rendition honors that heritage while dialing in chef-level technique: precise searing, controlled moisture, and balanced acidity for a craveable, repeatable result.

Optional Advanced Instructions:

Make-ahead: Caramelized onions and spread can be made up to 3 days ahead; store chilled. Warm onions gently before assembly.
Batching: Pre-portion beef into 2 oz balls and chill on a sheet tray. Work in quick rounds of two patties for best heat retention.
Gear: A flat-top or cast-iron griddle maximizes crust. No smash spatula? Double up two sturdy spatulas, or use a small saucepan bottom over parchment.

Timing:

Prep Time: 15 minutes
Cook Time: 30 minutes (Onions 20 minutes; Buns 3–4 minutes; Patties 6 minutes)
Total Time: 45 minutes
Course: Dinner or Lunch (Main Course)
Origin: American (Californian)

Nutrition

Calories: 896kcalCarbohydrates: 27gProtein: 27gFat: 77gSaturated Fat: 25gPolyunsaturated Fat: 20gMonounsaturated Fat: 26gTrans Fat: 2gCholesterol: 147mgSodium: 2597mgPotassium: 837mgFiber: 5gSugar: 18gVitamin A: 2021IUVitamin C: 17mgCalcium: 313mgIron: 4mg

Did you give this recipe a whirl?We're all ears to hear about your results!

FAQ

Can I make the caramelized onions ahead of time?

Yes, and it actually makes the cook easier. Make them up to three days ahead and store them in a sealed container in the fridge. Reheat a portion in the same pan you’ll use for the patties — one less dish.

Does the mustard-grilling technique work on a backyard grill?

It works, but it’s harder to control. A flat cast-iron skillet or griddle gives you direct contact across the whole patty face, which is what creates the even crust. On grill grates, the mustard can drip and flare before it has time to set.

What cheese does In-N-Out actually use, and does it matter?

They use American cheese, and yes, it matters for this specific burger. American melts fast and evenly over a hot patty, and its mild saltiness doesn’t compete with the spread or the mustard crust the way sharper cheeses would.

How do I know when the patty is done without cutting into it?

Use an instant-read thermometer and pull it at 160°F internal — that’s the safe target for ground beef. If you don’t have one, a firm press test is unreliable with thin patties, so a thermometer is genuinely worth having.