In a large bowl, combine ground beef, mayo, Worcestershire sauce, and minced onions and well combined
Form into 6 patties
Clean and cut potatoes, carrots, and onion and add to a large bowl
Drizzle with half of the oil and sprinkle with half of the Italian seasoning, stir
Drizzle with remaining oil and sprinkle remaining seasoning, stir
Divide vegetables into 6 packets and place hamburger patty on top of vegetables
Fold foil over and seal packet
Heat grill to medium heat or 325 degrees F
Place packets on the grill and cook for 20-25 minutes turning and slightly shaking packet often to prevent burning
Remove when vegetables are tender and hamburger is 150 degrees F for medium-well done
Serve immediately
Store leftovers in the refrigerator