1. In a large bowl, mix all the ingredients together.
2. Using slightly damp hands shape the mixture into 4 x 9cm/3½inch burgers. Cover and chill in the fridge for 20 minutes.
3. Cook the burgers on a prepared barbecue or preheated moderate grill for 6-8 minutes on each side until cooked and any meat juices run clear.
4. Serve the burgers in a burger bun with a salad garnish and a selection of relishes.