Gently break apart the ground beef in a large mixing bowl and shape into four patties with a thumb indentation.

Sprinkle Worcestershire sauce, black pepper, and salt on both sides of each patty and let them rest for about 10 minutes.

Preheat grill or skillet over medium-high heat, place the patties on and cook for 4-5 minutes, flip, and add cheddar during the last minute.

In a separate pan, heat oil and add onions, cooking until caramelized, about 10-12 minutes.

Assemble the burgers with a bottom bun, patty, bacon, caramelized onions, then the top bun.

Serve immediately with fries or salad.