01 -
Heat olive oil in a large skillet over medium heat. Add the sliced onions and cook for 10-12 minutes, stirring often, until golden and caramelized.
02 -
Stir in minced garlic and cook for 1-2 minutes until fragrant.
03 -
Add ground beef and cook until fully browned, breaking it apart with a spatula. Drain excess fat.
04 -
Stir in Worcestershire sauce, soy sauce, thyme, salt, and pepper. Let the mixture simmer for another 5 minutes for the flavors to come together.
05 -
While the meat mixture simmers, lightly toast the hamburger buns.
06 -
Scoop the beef mixture onto the bottom half of each bun, top with shredded Swiss cheese, and place the top bun. Garnish with chopped parsley before serving, if desired.