This Copycat In and Out Burger Animal Style Recipe is easy to make at home. Enjoy caramelized onions, sweet pickles and a special sauce. It all comes together for a delicious meal.
In a small bowl, combine ½ cup mayonnaise, ¼ cup ketchup, 2 tablespoons sweet pickle relish, and 2 tablespoons white vinegar. Stir until smooth and set aside.
For the Burgers:
Melt 1 tablespoon butter in a large skillet or cast-iron pan over medium-high heat.
Add 1 chopped white onion and sauté in the butter for 3–5 minutes, or until caramelized. Remove the onions from the skillet and set aside.
Divide 1 pound ground beef (80/20) into 4 equal portions and form each portion into a ball, about ¼ pound each.
Drizzle 2 teaspoons olive oil onto a skillet, cast-iron pan, or griddle over medium-high heat.
Place 4 hamburger buns cut-side down on the preheated cooking surface and toast for about 2 minutes. Remove and set aside.
Place the 4 beef balls onto the hot cooking surface. Top each with a piece of parchment paper and firmly press down with a burger press or large spatula to create thin patties. Remove and discard the parchment paper.
Season the patties evenly with 1 teaspoon salt and ½ teaspoon black pepper.
Cook the patties for about 2 minutes, until the juices begin to rise to the surface and the color starts to change.
Spread 1 tablespoon mustard onto the uncooked side of each patty while they continue cooking.
Carefully scrape underneath each patty to release the caramelized crust and flip. Do not press the patties again after flipping.
Cook for 1 minute, then place 2 slices American cheese on each patty.
Cook for 1 additional minute, or until the cheese is fully melted.
Spread the prepared sauce on both the top and bottom halves of each toasted hamburger bun.
Top each bottom bun with 2 iceberg lettuce leaves, sliced tomato, a cheeseburger patty, and a portion of the caramelized onions.
Add the top bun and serve immediately.
Notes
These burgers are best served fresh, but you can store the leftover patties in an airtight container for up to 1 week.