01 -
Shape the ground chuck into 150 g portions and roll into balls. Refrigerate the balls for 30 minutes to optimize searing and structure.
02 -
Using a mandoline slicer, carefully slice the onions into very thin rounds. Remove excess moisture with a paper towel and chill until use.
03 -
Cook turkey bacon in a hot frying pan until evenly crisp and golden. Drain excess fat, cool slightly, and finely chop for use in burgers and the sauce.
04 -
In a mixing bowl, combine mayonnaise, ketchup, mustard, chopped crispy turkey bacon, Worcestershire sauce, apple cider vinegar, all-purpose rub, and red pepper flakes. Stir until well incorporated and refrigerate until assembly.
05 -
Preheat a griddle or heavy frying pan over medium-high heat and coat with avocado oil. Space chilled beef balls apart, top each with sliced onions, and firmly smash with a burger press. Season with salt, black pepper, and garlic powder.
06 -
After 3-4 minutes, spread a layer of mustard atop each patty, then flip burgers. Place a slice of pepper jack cheese on each and cook until the cheese is melted, about 3 minutes more.
07 -
Place the burger buns cut side down on the griddle and toast until golden brown.
08 -
Spread baconnaise sauce on the base of each toasted bun. Stack two smash patties per serving, add more baconnaise sauce on top, and crown with the upper bun.