Brown your ground beef halfway, about 3-4 minutes, in your large skillet then add in the chopped onions, salt, pepper and Worcestershire sauce.
Cook the beef until fully browned, about 3-4 minutes, then add in the chopped pickles and stir.
Mix the McDonald's Copycat Big Mac Sauce ingredients in a medium bowl and stir well.
Add 1 cup of the secret sauce to the pan, reserve the rest for your buns.
Cook 1 additional minute then serve on sesame hamburger bun (stacking order in notes below).
