Lisa Diep

The top 24 try to stand the heat in the kitchen, with 90 minutes and an open pantry to cook their dishes and impress the judges, focusing on hospitality.

Three chefs fight for survival in the first elimination challenge. They are given 75 minutes to cook a dish with ingredients from their home fridge and pantry.

It is the first mystery box challenge, with one contestant choosing eight ingredients for chefs to cook from and make a dish in 75 minutes.

Nigella Lawson returns as the guest judge with her choice of mystery box ingredients, including marsala, chicken livers, squid and condensed milk.

The three contestants on the bottom after the invention test go head-to-head in a pressure cook off, while Maggie Beer presents their new challenge.

Contestants recreate dishes from one of Australia's best regional restaurants, Wickens at The Royal Mail in Dunkeld.