Mix the beef, onion, parsley, soy sauce and seasoning together. Shape into 4 burgers. Refrigerate until you are ready to cook. Heat the barbecue. Cook for about 5 minutes on each side until no pink meat remains at the centre of the burger and the juices run clear. Serve with the Spicy Red Pepper Salsa. To make the salsa: Whiz all the salsa ingredients in a food processor. This salsa is also great with the steaks.