Preheat the grill to medium-high heat or to 375°F.
In a large bowl, combine ground beef, Worcestershire sauce, minced garlic, and pepper. Mix with your hands until just combined (do not overmix).
Divide mixture into fourths and shape into patties using your hands. The patties should be about ¾ inch thick.
Use the back of a spoon to make an indent in the middle of each patty to keep it from puffing up too much in the middle while cooking. Sprinkle patties with seasoned salt.
Add burgers to the grill and cook for 3–3 ½ minutes per side, until the internal temperature reaches about 140°F (for a medium cook).
Place on a toasted bun and top with cheddar cheese, lettuce, tomatoes, and onions.