Succulent, freshly cooked fillings layered in a toasted artisan bun with melted cheese, crisp seasonal salad, and signature house sauce.
Whisk mayonnaise, ketchup, relish, yellow mustard, garlic powder, and paprika in a bowl; chill until needed.
Butter the cut sides of potato buns and toast on a hot flat griddle until golden and crisp; set aside.
Heat a cast iron griddle or skillet over high heat until smoking hot.
Place two cold beef balls on the dry smoking griddle; immediately place a piece of parchment over each and press down hard with a heavy burger press for 10 seconds to create ultra-thin patties with lacy edges.
Season aggressively with coarse salt and black pepper; top with paper-thin onion slices; cook undisturbed for 2 minutes until edges are deeply caramelized and crispy.
Scrape under patty with a sharp spatula, flip, and immediately top each with a slice of American cheese; stack one patty on top of the other; cook for 1 minute until cheese melts.
Spread burger sauce on bottom bun, add pickle slices, place double smash patties with melted cheese, cap with top bun, and serve immediately.