10 oz. lean (85%) ground beef
1/2 teaspoon kosher salt
1/4 teaspoon freshly ground black pepper
Several dashes of Worcestershire sauce
1/2 medium red onion, sliced
4 large lettuce leaves
1/2 beefsteak tomato, sliced
Toppings: ketchup, mustard
Preheat grill to 350° to 400°F (medium-high).
Combine beef, salt, pepper and Worcestershire sauce. Shape mixture evenly into 2 patties.
Grill burgers and onions on lightly oiled grill rack, covered with grill lid, 2 minutes on each side or until onions are soft and burgers are desired degree of doneness.
Place lettuce leaf on serving plate; top with burger, onion, tomato, desired toppings and remaining lettuce leaf. Repeat procedure; serve immediately.