01 -
Divide ground chuck into 1/3 pound portions, shape lightly into balls, and chill for 30 minutes.
02 -
Safely slice onions as thin as possible with a mandoline. Drain excess moisture and refrigerate.
03 -
Cook bacon over medium heat until golden and crispy. Then chop into small pieces.
04 -
Blend mayonnaise, mustard, Worcestershire, ketchup, vinegar, seasonings, red pepper flakes, and bacon chunks thoroughly.
05 -
Preheat the griddle until very hot. Drizzle with avocado oil. Space chilled beef balls on the surface, top with onions, and smash firmly. Season generously.
06 -
Let patties cook for 3 minutes to form a browned crust. Brush with mustard, flip, add cheese, and cook for another 3 minutes.
07 -
Toast buns lightly on the griddle. Spread sauce on the bottom bun, stack two patties, add more sauce, and cover with the top bun.