Mix the salt and pepper with the ground beef. Mix in the chopped onion, bread crumbs, and Worcestershire sauce. Form the ground beef into 6 to 8 patties.
Melt the butter or margarine in a frying pan. Add the hamburger patties and cook for a total of 6 to 8 minutes or until browned on each side and cooked through, turning the burgers only once. Toast the hamburger buns before assembling the burgers if desired.
Planning an outdoor picnic? Whether you're cooking indoors or outdoors, make sure that the hamburger is thoroughly cooked — the internal temperature should be at least 160°.