01 -
Roll fresh ground chuck into loose 1/3-pound balls and refrigerate for 30 minutes to firm up.
02 -
Using a mandoline with a safety guard, slice onions whisper-thin. Squeeze out excess moisture and keep them cold until ready to use.
03 -
Fry thick-cut bacon until golden and crisp, then chop it into small pieces for the baconnaise sauce and toppings.
04 -
In a bowl, stir together mayonnaise, ketchup, mustard, bacon bits, Worcestershire sauce, apple cider vinegar, house seasoning blend, and crushed red pepper flakes until well combined. Set aside.
05 -
Heat the griddle until screaming hot. Add pure avocado oil and place chilled burger balls on the griddle with space between them. Top each ball with sliced onions, then smash firmly with a spatula and season generously with salt, black pepper, and garlic powder.
06 -
After 3 minutes, or once a good crust forms, brush the tops of the patties with yellow mustard. Flip the patties, add slices of pepper jack cheese, and cook for an additional 3 minutes until the cheese melts.
07 -
Toast the burger buns lightly on the griddle. Spread baconnaise sauce on the bottom bun, stack two patties on top, add more sauce, and crown with the top bun. Serve immediately while hot.