Heat olive oil in a medium sauté pan over medium high heat. Add onions and sauté 10 to 12 minutes or until caramelized and translucent. Cool slightly.

In a large bowl, combine onions with ground beef. Divide into 4 portions and form into ½-inch thick patties.Season both sides lightly with pepper.

Cook burgers on a preheated grill for 8 minutes per side for medium rare or about 12 minutes per side for medium or longer depending on desired doneness.

Remove from grill and let rest for 5 minutes. Place each burger on a sesame bun with 1 lettuce leaf, 1 tablespoon Special Sauce, and a slice of tomato.

TIP: When making burgers, remove the ground meat from the fridge about 20 minutes before forming into patties. Resist the urge to over handle while trying to form perfect-looking burgers. Over handling will cause the meat to toughen.