Preheat a gas grill to medium heat, or prepare a medium-hot fire in a charcoal grill with a cover.
To make patties, combine the beef, egg, garlic, liquid smoke, salt, celery salt, pickled ginger, dried parsley, and Panko bread crumbs in a large bowl; mix well.
Handle the meat as little as possible to avoid compacting it. Divide the mixture into 8 equal portions and form the portions into patties to fit the buns.
To avoid having your meat stick to the grill, when the grill is ready, brush the grill rack with vegetable oil. Place the patties on the rack. Close the cover and cook, carefully turning once (to prevent juices from escaping), until done to preference, 5 to 7 minutes on each side for medium.
Add your favorite toppings to the buns and assemble the burgers. Top with freshly ground pepper before adding the top bun; serve!