- 1 pound ground beef, cold
- 1 teaspoon salt
- 1 teaspoon pepper
- 3 tablespoons butter, divided
- 4 hamburger buns
- ¼ cup mayonnaise
- 1 teaspoon Dijon mustard
- 1 teaspoon ketchup
- ½ teaspoon dill pickle brine
- 1 pinch cayenne pepper
- 4 slices American cheese
- 8 slices thinly sliced tomato
- 4 pieces of leafy romaine lettuce
- Separate the ground beef into 4 equal portions. Make a hockey puck-sized patty with each portion.
- Combine the salt and pepper to make a seasoning mix, and sprinkle half on the tops of the 4 burgers. Refrigerate for 5 minutes, or until ready to cook.
- Melt 1 tablespoon butter and brush the melted butter onto the inside of each bun. Toast the buns, buttered side down, in a skillet over medium heat, until browned and crispy on the edges. Remove them from the heat.
- To make the sauce, mix together the mayonnaise, Dijon mustard, ketchup, pickle brine, and cayenne until well-incorporated. Spread the sauce on the tops of the toasted buns.
- To cook the burger patties, heat a cast iron skillet over medium-high heat. Melt the remaining butter, and once sizzling, place a cold burger patty into the skillet, seasoned side down. Immediately press down firmly with a grill press or large spatula. Flatten the burger completely, and once it's beginning to brown, remove the grill press.
- Season the top of the burger and cook until deeply browned. Flip, pressing down again if the burger begins to puff upwards.
- Add cheese to the top of the burger. Cook until the burger is deeply browned and the cheese is melted, about 1-2 minutes, then remove it from the heat.
- Repeat the cooking process with the remaining 3 burgers.
- To build the smash burger, layer the cheeseburger on the bottom bun, and top it with 2 slices of tomato and lettuce. Complete the burger with the sauced bun top.