1. Preheat the grill. 2. Mix all the ingredients together with a fork, check the seasoning. 3. With wet hands shape the meat into flattish rounds making sure they are equal in size. 4. Make a slight dip in the centre, they will shrink and thicken when they cook. 5. Grill steadily turning only once. 6. Allow 3 minutes each side for a rare burger and 5 minutes for well done.