Put the ground beef, salt, pepper and Worcestershire sauce in a bowl. Using your hands, mix them together until well blended.

Divide the meat mixture in 8 equal portions. Form the portions into 8 patties 1/4-inch-thick.

Place 1 tomato slice on 1 patty. Top with another patty. Use your fingers to press the edges together to seal. Repeat this step to make 4 filled patties.

Put a large skillet on the stove and switch on the heat to medium. When the skillet is hot, after about 1 minute or so, carefully put the hamburgers in the pan. Cook until browned on the underside, about 6 minutes. To check, lift a corner of the burger with the spatula and peak underneath. Flip over the hamburger and cook on the second side until browned and cooked through, about 6 minutes longer.

5. Use the spatula to transfer the burger onto the bun.

SERVING SUGGESTION: Serve with lettuce leaves, pickle slices, ketchup, and mustard.