Big Mac Smash Burger Tacos with Secret Sauce Step-by-step instructions

Before you start

Before you start, gather all your ingredients and equipment. Take the ground beef out of the fridge and let it sit at room temperature for about 15 minutes—this helps it smash more easily. Whisk together the secret sauce ingredients in a small bowl and set aside.

Shred the iceberg lettuce and slice the dill pickles if they're not already chips. Have your cast-iron skillet and burger press ready. Everything should be prepped and within reach, as the cooking process moves quickly once you start.

Instructions

Prep and Smash

1. 1Prepare the Beef and Sauce
   Divide the ground beef into 4 equal portions, about 3 ounces each. Roll each portion into a ball. In a small bowl, whisk together the mayonnaise, ketchup, Dijon mustard, minced onion, sweet relish, and white vinegar until smooth. Set the sauce aside. Season the beef balls generously with salt and black pepper on all sides.
   Look for The sauce is creamy and pinkish-orange with visible flecks of onion and relish.
   Tip Keep the beef cold until ready to smash for the best crust.
2. 2Smash the Beef onto Tortillas
   Place a flour tortilla on a clean work surface. Put one beef ball in the center and use a burger press or your palm to smash it paper-thin, spreading the meat evenly to the edges of the tortilla. Repeat with the remaining tortillas and beef. Season the exposed meat lightly with more salt and pepper.
   Look for The beef is thin and evenly covers the tortilla, with ragged edges.
   Tip Use parchment paper between the press and beef to prevent sticking.

At the end of this phase, you should have four tortillas topped with thin, even layers of seasoned ground beef, and a bowl of creamy, tangy secret sauce. The beef should be spread to the edges, and the sauce should be smooth and well combined. The kitchen should smell of fresh onion and relish, with a hint of mustard. Everything is ready for the hot skillet.

Sear and Melt

3. 3Sear the Beef Side
   Heat a large cast-iron skillet over high heat until smoking. Carefully place the tortillas beef-side down in the skillet, working in batches if needed. Press firmly with a burger press or spatula for 10 seconds. Cook undisturbed for 3 minutes, until the beef is deeply caramelized and the edges are crispy.
   Look for The beef has a deep brown crust and releases easily from the pan.
   Safe temperature 160°F (71°C) internal temperature (ground meat)
   Tip Don't move the beef while searing; the crust needs time to form.
4. 4Flip and Crisp the Tortilla
   Using tongs, flip each taco so the tortilla side is down. Cook for 1-2 minutes, pressing gently, until the tortilla is golden and crisp. The beef should be cooked through, reaching an internal temperature of 160°F (71°C) for safety.
   Look for The tortilla is golden brown and crispy, with the beef fully cooked.
   Safe temperature 160°F (71°C) internal temperature (ground meat)
   Tip If the tortilla puffs up, press it down to ensure even crisping.
5. 5Add Cheese and Melt
   Place a slice of American cheddar cheese on top of each beef patty. Cover the skillet with a dome or lid and cook for 1 minute, until the cheese is fully melted and gooey.
   Look for The cheese is completely melted and bubbly over the beef.
   Tip Use a clear dome to watch the cheese melt without lifting the lid.

The beef should be deeply browned and crispy, with a rich, savory aroma filling the kitchen. The tortillas are golden and crisp, and the cheese is fully melted, creating a gooey, glossy topping. The sizzle of the skillet should be music to your ears, and the smell of seared beef and melted cheese is irresistible. Check that the beef reaches 160°F (71°C) before moving on.

Top and Serve

6. 6Drizzle with Secret Sauce
   Remove the tacos from the skillet and place them on a serving plate. Drizzle the prepared secret sauce generously over the cheesy beef, ensuring even coverage.
   Look for The sauce pools slightly on the cheese, creating a glossy finish.
   Tip Warm the sauce slightly if desired, but it's great at room temperature.
7. 7Top with Lettuce and Pickles
   Sprinkle the shredded iceberg lettuce evenly over the sauced tacos. Scatter the dill pickle chips on top. Fold each taco in half, pressing gently to keep the filling in place.
   Look for The lettuce is crisp and the pickles are visible on the glossy sauce.
   Tip Add the lettuce and pickles just before serving to keep them crunchy.
8. 8Serve Immediately
   Serve the Big Mac Smash Burger Tacos hot, while the tortillas are crispy and the cheese is molten. Enjoy the juicy, saucy, crunchy perfection in every bite.
   Look for The tacos are golden, crispy, and loaded with toppings.
   Tip Serve with extra sauce on the side for dipping.

The tacos are now topped with a generous drizzle of secret sauce, crisp shredded lettuce, and dill pickle chips. The tortillas are folded in half, with the filling peeking out.

The contrast of warm, savory beef and cool, crunchy toppings is visually appealing. The aroma is a perfect balance of tangy sauce, fresh lettuce, and pickles. Serve immediately for the best texture.

Common mistakes

One common mistake is not heating the skillet enough—if it's not smoking hot, the beef won't get that crispy crust. Another is pressing the beef too gently, which prevents proper contact with the pan. Make sure to use firm, even pressure.

Overcrowding the skillet can also cause steaming instead of searing, so cook in batches if needed. Finally, don't flip the tacos too early; let the beef cook undisturbed for the full 3 minutes to develop the crust.

How to tell it’s done

The beef is done when it reaches an internal temperature of 160°F (71°C) on an instant-read thermometer. The meat should have a deep brown crust and be cooked through with no pink in the center. The tortilla should be golden brown and crispy, and the cheese should be fully melted and bubbly.

To test doneness, insert the thermometer into the thickest part of the beef patty, avoiding the tortilla. If it reads 160°F (71°C), it's safe to eat. The tacos are best served immediately while still hot and crispy.

• Ground meat: 160°F (71°C) in the thickest part