• Start by slicing the onion into thin half-moons. Place them in a pan over medium-low heat together with the butter. Cook for 30 to 45 minutes until they start to caramelize, adding more butter as necessary. Once ready, stir in the balsamic glaze and mix thoroughly.

For Burgers:

• Prepare your burger patties by mixing the ground beef with mayo. Shape the mixture into medium-sized balls and place each one on a piece of parchment paper.
• Heat a pan over medium-high heat and cook the patties. Flip each meatball onto the pan with the parchment paper facing up. Use a spatula to press down on the parchment, creating very thin patties. Carefully remove the parchment paper and discard. Add a pinch of salt to each patty and cook for 2 minutes on each side until they are browned. Top each patty with a slice of American cheese and set aside.
• Toast the burger buns in the same pan used for the patties, adding butter or mayo to achieve a golden brown color.

For Sauce:

• Create the sauce by combining equal portions of mayo, mustard, and ketchup with the chopped pickle, smoked paprika, and Worcestershire sauce.

To Assemble:

• To assemble your burgers, start with the toasted buns, adding a spoonful of the prepared sauce, followed by shredded lettuce, two cheese-topped patties, caramelized onions, additional pickles if desired, and complete it with the top bun smeared with more sauce. Enjoy your meal!