01 -
Heat butter and olive oil on griddle over medium heat. Add sliced onions and a pinch of salt, then cook for 10-15 minutes until golden. Stir in Worcestershire sauce and balsamic glaze, then cook for an additional 2-3 minutes. Set aside.
02 -
Combine mayonnaise, ketchup, yellow mustard, dill pickle juice, paprika, and hot sauce (if using) in a bowl. Mix until smooth, then refrigerate until needed.
03 -
Preheat griddle to 450-500°F. Form ground beef into loose 3-4 oz balls without compacting.
04 -
Place beef balls on the hot griddle and smash immediately with firm pressure. Season with salt and black pepper, then cook for 1½-2 minutes until edges are crispy.
05 -
Flip patties, add cheese slices on top, and cook for 1 more minute. Toast the burger buns cut-side down on the griddle until golden.
06 -
To assemble, place pickles on the bottom bun, followed by a cheesy beef patty, caramelized onions, and a generous spread of burger sauce on the top bun. Serve immediately.