Smashed Burgers

From Cooks Illustrated

Do not use a stainless-steel or nonstick skillet. You can use 85 percent lean ground beef, but 90 percent lean will produce a dry burger. Open a window or turn on your exhaust fan before cooking. Be assertive when pressing the patties. Use Kraft singles here for their meltability. Once the burgers are cooked, transfer to a wire rack set in a rimmed baking sheet, adding cheese to the burgers and keep warm in a 200-degree oven. Place on buns right before serving.

Sauce (for 2 burgers):
2 tablespoons mayonnaise
1 tablespoon minced shallot
1 1/2 tablespoons finely chopped dill pickles plus 1/2 teaspoon pickle juice
1 1/2 teaspoons ketchup
1/8 teaspoon peppper

Burgers (four double patty burgers):
4 hamburger buns, toasted if desired
1 pound (16 ounces) 80 percent lean ground beef
1/2 teaspoon vegetable oil
1/2 teaspoon salt

4 slices American cheese

1. FOR THE SAUCE: stir all the ingredients together in a bowl. (make sure shallot and pickles and finely chopped/minced).

2. FOR THE BURGERS: Divide beef into 8 equal pieces (2 ounces each); form into loose, rough balls (do not compress). Place oil in a 12-inch cast-iron skillet. Use paper town to rub oil into bottom of skillet (reserve paper towel). Heat over medium-low heat for 5 minutes. While skillet heats, wrap bottom and sides of small saucepan with large sheet of aluminum foil, wrapping foil around the upper rim of the saucepan, and place large plate next to cooktop.

3. Increase heat to high. When skillet begins to smoke, place 3 balls of beef about 3 inches apart in skillet. Use bottom of prepared saucepan to firmly smash each ball until 4 inches in diameter and thin. Place saucepan on plate next to cooktop. Sprinkle patties with a little bit of salt and pepper. Cook until at least three-quarters of each patty is no longer pink on top, about 2 minutes (patties will stick to skillet - this is good and means that they have made full contact with pan and browned uniformly). Use thin metal spatula to loosen patties from skillet. Flip patties and cook for 15 seconds. Slide skillet off heat. Transfer 1 burger to each bun bottom and top with 1 slice of cheese. Gently scrape browned bits from skillet and return to heat (add more oil if needed). Repeat with the remaining beef balls. Spread sauce on bun tops and serve immediately.