In a large bowl, combine the ground beef, pork, onion, celery, carrot, green onions, garlic, Worcestershire sauce, egg, ⅓ cup of ketchup, breadcrumbs, parsley, salt, and pepper. Mix everything together using your hands or a sturdy spoon until well combined.
1 ½ pounds ground beef, ½ cup onion, 1 rib celery, ½ cup carrot, ¼ cup green onion, 3 cloves garlic, 2 teaspoons Worcestershire sauce, 1 large egg, ⅔ cup ketchup, ½ cup fresh bread crumbs, 3 tablespoons fresh parsley, Salt and pepper
In a small bowl, stir together the remaining ketchup, Worcestershire sauce, Dijon mustard, and brown sugar until smooth. Brush half of this mixture over the top of the meatloaf, covering it completely.
1 tablespoon Dijon mustard, 1 tablespoon Worcestershire sauce, 2 tablespoons light-brown sugar