The three best performers in the invention test are vying for immunity. The winner of round one will cook off against season two runner-up Callum Hann.

The eight members of the losing team from the Mexican challenge are facing elimination. With 90 minutes on the clock and an open pantry, the contestants must re-invent a classic French dish.

For the elimination challenge, the contestants go to Maggie Beer's Eatery in the Barossa Valley. Plus, a masterclass takes place at the Adelaide Markets.

MasterChef alumni Poh, Callum and Reynold present the contestants with three dishes from their venues. Contestants must create a dish worthy of a place on the menu at any of these establishments.