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.
Stir the sauce ingredients together in a small bowl until smooth. Set aside.
For the Burgers:
Melt the butter in a large skillet or cast-iron pan over medium-high heat.
Add the onion and sauté for 3–5 minutes, until caramelized. Remove from the skillet and set aside.
Divide the ground beef into 4 equal portions and shape each portion into a ball.
Drizzle the olive oil onto a skillet, cast-iron pan, or griddle over medium-high heat.
Place the buns cut-side down on the hot cooking surface. Toast for about 2 minutes, then remove and set aside.
Place the beef balls on the hot cooking surface. Cover each ball with a piece of parchment paper and firmly press with a burger press or large spatula to form a thin patty. Remove and discard the parchment paper.
Season the patties with salt and pepper. Cook for about 2 minutes, until the juices begin to rise to the surface and the color starts to change.
Spread 1 tablespoon of mustard over the uncooked side of each patty.
Scrape underneath each patty to release the caramelized crust, then flip. Do not press the patties again.
Cook for 1 minute, then top each patty with 2 slices of cheese. Cook for 1 more minute, or until the cheese melts.
Spread the prepared sauce on both halves of each toasted bun.
Layer 2 lettuce leaves, sliced tomato, a cheeseburger patty, and caramelized onions on each bottom bun. Add the top buns 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.