Classic Diner Burger

• For the thousand island dressing:
• 1 cup mayonnaise
• 1/8 cup ketchup
• 1 tablespoon prepared horseradish
• 1 1/2 teaspoons worcestershire sauce
• 1/2 teaspoon kosher salt
• 1/4 teaspoon black pepper
• 1 hard boiled egg, shelled and minced
• 1/4 cup chopped bread and butter pickles
• For the burgers:
• 1 1/2 pounds ground beef, preferably chuck
• 1 tablespoon lemon juice
• 1 tablespoon worcestershire sauce
• 1 teaspoon kosher salt
• fresh ground black pepper
• 4 good quality soft white hamburger buns
• 1 large onion, cut into half inch slices, you should get four.
• 2 tablespoons bacon grease
• a plate of extra toppings: iceberg lettuce, shredded, American cheese, tomato, and pickles of all sorts

1. Pre heat the oven to 350 degrees. Place the ground chuck, worcestershire, lemon juice and salt into a bowl. Mix until well combined. Divide into four equal sized patties that are about a 1/2 to 3/4 inch thick. Then season the up side with lots of black pepper.
2. Place a 12 inch cast iron skillet over medium heat. Add the bacon grease and the four slices of onion. Season the onions with salt and pepper. Saute the onions until they are soft and caramelized on each side. When they have browned place them on a sheet tray.
3. Turn the heat to high and gently place the burgers into the pan, black pepper side down. Season they tops with more black pepper. Sear them until good and cararmelized on each side. Remove to the sheet tray with the onions to let them rest. After 10 minutes slide the tray into the oven and reheat the burgers to your desired temperature. I prefer medium rare to medium.
4. Butter the insides of each bun. Wipe out the skillet and then toast each bun. Assemble the burgers with the onion, Thousand Island dressing and serve.
5. For the Thousand Island dressing:
6. Combine all the ingredients into a mixing bowl and mix until combined.

mayonnaise, ketchup, horseradish, worcestershire sauce, kosher salt, black pepper, egg, bread, burgers, ground beef, lemon juice, worcestershire sauce, kosher salt, fresh ground black pepper, buns, onion, bacon grease, american cheese

Taken from food52.com/recipes/5789-classic-diner-burger (may not work)