The question as stated is incorrect. New Zealand is quite a major producer of food, and is a nett exporter of food. The same would apply to Australia. Both countries import foods that are not grown within the country.
who is the national organisation that advises on food regulations in Australia & new zealand
Red Meats are as they are Imported from countries witch are cheaper such as new zealand.
No barley is an imported plant.
Australia, New Zealand.
red cod
Because, like any country, it cannot produce all the food it needs itself. Some foods don't grow or are not made in Australia, so those would be imported. They may not always have the quantities of food they need, so some has to be imported.
Some food has not travelled far at all, and other foods have been imported from places around the planet.
FSANZ - Food Safety Authority Australia New Zealand
Everything in use in Antarctica, including food, is imported from somewhere. Specifically, the US Antarctic Programme imports fresh produce from New Zealand during the austral summer months.
Pavlova is a New Zealand invention, (claim by Australia) to celebrate the tour of Australia and new zealand by a famous Russian ballerina (Anna Pavlova) So so its not at all Italian :)
Virtually all of Australia's food culture is imported. so aside from the various forms of bush tucker there is no great local eating tradition.
Vegemite, Pavlova (actually a New Zealand invention which was named in Australia), ANZAC biscuits, Tim Tams, lamingtons, chiko rolls.