Form the ground beef into individual patties, and place each patty on a piece of foil large enough to hold the patty and some vegetables. Layer each patty with onion slices, carrots, and potato slices. Season with seasoned salt, salt, and pepper to taste. Wrap foil around food, and seal each packet tightly.
Grill 30 minutes, or until the potatoes are tender. Carefully open each packet (the steam that escapes will be very hot), and serve.
