Genene Dwyer

The amateur cooks have one hour to recreate their signature dishes for the judges' first auditions, as the judges and nine past winners offer their support.

The contestants split into two teams of 10 to take over two cafés and face off in a battle of brunches, where they race to serve real customers.

It is time for another immunity challenge, with a cook-off against Alanna Sapwell, head chef of Saint Peter restaurant.

The chefs have only 45 minutes to cook a prawn dish with their assigned cuisine: French, Greek, Mexican, Spanish, Thai and Vietnamese.

Nigella's pressure test for the chefs is a chocolate feast, with 75 minutes to recreate four of her chocolate desserts, including a ruby chocolate cheesecake.

This time, after being split into teams, the contestants are tasked with operating Adelaide's first ever `MasterChef' night market.