Preheat oven to 180°C.
Fry onion, apple and sage in a little oil until soft.
Stir in walnuts and set aside.
Slit the fillets down the length and divide the apple mixture evenly.
Wrap the bacon around each fillet and secure.
Place in the oven for 30 minutes and roast till cooked though at 180°C.
Serve with brown rice, vegetables and KNORR Sausage Gravy prepared as per packet instructions.