Mix all together in a bowl then form into four burgers about 10cm in diameter.  Cook on an oiled griddle pan over moderate heat for 5-7 minutes each side, or until cooked through.  Serve as Bill suggests, in a toasted bun with rocket, red onion and roasted red capsicum and sweet potato fries on the side.  Or as we had them, just as they were, with a green vegetable.