01 -
Form ground chuck into 1/3 pound balls and refrigerate for 30 minutes.
02 -
Slice white onions very thin using mandoline with safety guard. Squeeze out excess water and refrigerate.
03 -
Crisp up bacon, chop, and set aside.
04 -
Mix mayo, ketchup, mustard, bacon, Worcestershire sauce, apple cider vinegar, all-purpose rub, and red pepper flakes. Refrigerate.
05 -
Heat griddle to medium-high. Add avocado oil and burger balls, spaced 2-3 inches apart. Top with sliced onions and smash with burger press. Season with salt, pepper, and garlic.
06 -
Cook 3-4 minutes, add mustard on top, flip, add pepper jack cheese. Cook about 3 more minutes until cheese melts.
07 -
Toast buns on griddle. Layer with Baconnaise sauce, double smash burgers, more sauce, and top bun.