Charlie Sartori

The bottom three from Nigella's invention test face elimination in what might be the toughest pressure test ever, as contestants have just one hour to recreate Nigella's three-course meal.

The top 24 contestants enter the kitchen for their first mystery box challenge to create a dish with ingredients chosen by 2015 MasterChef Australia winner, Billie McKay.

Contestants have 75 minutes to create a delicious dish based on Nigella Lawson's divine indulgences. The top three will have a chance at immunity, while the bottom three face elimination.

A fete in Negella Lawson's name is held and the contestants are split off into three teams. The teams must prepare one savoury dish and two sweet dishes to sell, with all proceeds donated to the Royal Children's Hospital.

The bottom three from the invention test face the elimination pressure test. Contestants are given just over three hours to recreate UK chef Jason Atherton's quail afternoon tea dish to avoid elimination.

The contestants are split into two teams for a service challenge. Each team must cook a three-course meal for 30 people, replicating dishes from two celebrated Melbourne restaurants.