In a saucepan, mix the Worcestershire sauce, brown sugar, garlic powder, seasoned salt, celery seed, Italian seasoning, and basil. Stirring constantly, bring to a boil and cook 1 minute.
In a large bowl, mix the sauce, ground beef, and onion. Form into burgers.
Lightly oil the grill grate.
Place burgers on the grill, and cook 5 minutes per side, or until well done. Season with salt and pepper.