A mustard-grilled double-double cheeseburger with fresh tomato and lettuce next to a tray of loaded animal-style fries with melted cheese and caramelized onions.

In-N-Out Inspired Double Double Burger & Animal Fries

Experience the ultimate cult-classic burger right in your own kitchen. This 'Animal Style' duo features two juicy beef smash patties, mustard-grilled for maximum tang, stacked high with melted American cheese and fresh toppings. Paired with golden chips smothered in cheese, jammy caramelized onions, and a signature zesty burger sauce, it’s a masterclass in fast-food indulgence made with premium ingredients.

AuthorStutz Supper Club
Category,
DifficultyIntermediate
Yields2 Servings
Prep Time15 mins
Cook Time25 mins



Shopping list

1 Double Double Burger Ingredients

Animal-Style Fries

Ingredients (2 portions)

  • 400g frozen straight-cut chips or make your own
  • 1 medium onion, finely diced
  • 1 tbsp butter
  • 1 tsp sugar
  • 4 slices American-style cheese
  • 4 tbsp of Animal Burger Sauce (see above recipe to make the burger sauce)

“Animal Style” Burger Sauce

Ingredients

  • 3 tbsp mayonnaise
  • 1 tbsp ketchup
  • 1 tbsp finely chopped pickles (gherkin works perfectly in the UK)
  • 1 tsp American mustard
  • 1 tsp white vinegar
  • ¼ tsp garlic powder
  • ¼ tsp freshly ground black pepper

Method

Double Double Burger
1

Make the sauce: In a small bowl, mix all sauce ingredients until smooth.
Set aside for 10–15 minutes if you can (even while cooking everything else).

2

Cook the patties:

  • Heat a frying pan or griddle on high.
  • Cook 1 side of the pattie for ~2–3 minutes. Whilst that is cooking squeeze American mustard on the raw side and spread around to cover the patty.
  • Once the first side of the patty is cooked flip over to cook the mustard covered side for 2 to 3 minutes.
  • Add a slice of cheese to each patty in the last minute.
3

Toast the bun: Butter the cut sides and toast in the pan until golden.

4

Assemble:

  • Bottom bun → sauce → first patty → tomato → lettuce
  • Add second patty → more sauce → top bun
Animal-Style Fries
5

Cook the chips: Cook in the oven or air fryer according to packet instructions until golden and crispy.

6

Caramelise the onions:

  • Heat a frying pan on medium-low heat
  • Add 1 tbsp butter and let it melt
  • Add the diced onion and cook gently for about 5 minutes
  • Stir in 1 tsp sugar
  • Continue cooking for 10–15 minutes, stirring occasionally

You’re aiming for:

  • Soft texture
  • Deep golden colour
  • Slightly sticky, jammy finish
  • (If they start catching, add a tiny splash of water and keep going.)
7

Assemble the fries:

  • Put hot chips on a plate or tray
  • Lay cheese slices over the top (they should melt from the heat)
  • Spoon over the caramelised onions
  • Drizzle generously with burger sauce

A mustard-grilled double-double cheeseburger with fresh tomato and lettuce next to a tray of loaded animal-style fries with melted cheese and caramelized onions.

Ingredients

 2 beef smash burger patties
 6 slices American-style cheese (2 for burger, 4 for fries)
 1 soft burger bun (brioche recommended)
 1 large tomato slice
 1 leaf baby gem lettuce
 2 tbsp butter (divided)
 400 g frozen straight-cut chips
 1 medium onion, finely diced
 1 tsp sugar
 7 tbsp mayonnaise (3 for burger, 4 for fries)
 1 tbsp ketchup
 1 tbsp finely chopped pickles or gherkins
 1 tsp American mustard
 1 tsp white vinegar
 0.25 tsp garlic powder
 0.25 tsp freshly ground black pepper
In-N-Out Inspired Double Double Burger & Animal Fries
IngredientsDirections

Leave a Reply