Method

1. In a bowl, mix ground beef, egg, onion, bread crumbs, Worcestershire sauce, garlic, sea salt, and pepper until well combined. Divide mixture into four equal portions and shape each into a patty about 4 inches wide.
2. In a grill pan over high heat add olive oil (let it heat) and lay the burgers. Grill burgers, turning once until browned on both sides, about 3-4 minutes on each side. Remove from grill.
3. Lay buns, cut side down on grill and cook until lightly toasted, 30 seconds to 1 minute.
4. Spread mayonnaise and ketchup on different sides of the buns. Add lettuce, tomato, burger and onion. Cover with the other half of bun.
5. Serve with French fries.