Preparation time: 10 minutes
Time to cook: 15 minutes
Mix together the pork, grated apple, onions and lemon rind. Season with black pepper and form into 4 large or 8 small burgers.
Cook under a preheated grill set to medium for 5-7 minutes on each side or until firm to press and cooked through.
Cut the eating apple(s) into 4 slices. Arrange on split wholemeal rolls and top with the burger.