1 small onion, grated
3 small courgettes, grated
1 tsp soy sauce
1 level tsp grated fresh root ginger
1 egg yolk
salt and freshly ground black pepper
1. Mix all the ingredients together in a bowl until well combined. Divide the mixture into four and shape into burgers using your hands.
2. Preheat the grill to a medium setting. Line a grill rack with foil and arrange the burgers on top. Cook for 6-7 minutes on each side until cooked through.
3. Serve with a tomato and red onion relish and crisp salad leaves or a selection of Free vegetables.