Tuesday episodes feature the Immunity Challenge, where the winner of the Sunday challenge competes against a guest, which can vary from a chef, apprentice, or to a home cook in a cook off. The contestant is given the choice of two pantries of ingredients they can use, usually contrasting such as \"Black\" and \"White\". The contestant gets a head start to complete the dish before their opponent starts cooking and after the allotted time for both is finished, the dishes are presented to the judges for tasting and scoring out of ten. The judges are not aware which dish was made by which person, however. If the contestant's dish's score is equal to or higher than that of the guest, they are crowned the winner of the challenge. In the first series they are given a free pass to the finals week of the competition and can go home. From series 2 onwards, they receive a pin that allows them to save themselves from one future elimination.
The one-hour series premiere of MasterChef Australia attracted an average of 1.42 million viewers, making it the most watched show in its timeslot. Ratings steadily grew throughout the first series, with the show dominating Australian ratings as it entered finals week, averaging around or above 2 million viewers an episode, and on daily rankings placing ahead of other high rating shows such as the Seven Network's Packed to the Rafters and Nine's Rugby League State of Origin broadcast. Its success is despite initial belief from critics that the series would be a dud based on the performance of previous prime time cooking shows, as well as general cynicism against a new reality show format. 153554b96e