1 lb lean ground beef
Half-an-onion very finely chopped
1 tbsp Worcestershire sauce
Salt and pepper
4 good quality hamburger buns
Grape seed oil
Vegetable oil spray
Sweet green relish
Thinly sliced onion
Place lean ground beef in a large mixing bowl. Add onion, Worcestershire sauce, and pinches of salt and freshly ground black pepper. Whisk egg slightly in a separate bowl and add to beef bowl. With clean hands mix all ingredients together being careful not to over mix.
Place tin foil on a sheet or tray. Spritz foil with vegetable oil spray. Taking approximately one fourth of the beef mixture use your hands to shape a ball. Place ball on foil sheet and flatten with a spatula to about three quarters of an inch thickness. Make an indentation with your thumb in the middle of the patty to help it stay flatter while cooking. Repeat this procedure three more times until you have four patties of equal size. Cover with plastic wrap and refrigerate until needed.
When ready coat a heavy skillet (I use a cast iron grill) with grape seed oil, or another oil with a high smoke point, and bring to a moderate high heat. (Never use olive oil at high temperatures.) Cook patties for five minutes on each side. It is important that hamburger meat be cooked through. If desired, place a piece of lettuce on the bottom half of each bun followed by a cooked patty on each. (You can toast the buns beforehand.) Patties may then be topped with a combination of sliced onion, tomato, ketchup, mustard or whatever you like. Cover with remaining bun halves. Serve