Customs is a very important part of protecting Australia from foreign pests & diseases. You must declare ALL foodstuffs when entering Australia. Some foods cannot be imported at all & will be taken from you & destroyed. There are big penalties for false declarations in regard to food & plants so it is imperative that all of these are declared as you arrive. Full information can be found at the Australian Customs website

 Duty free concessions are also found on the customs website. Australian Customs