MasterChef Australia

The judges are joined by special guest Jamie Oliver, as the contestants prepare for a season of secrets and surprises.

Jamie Oliver returns to present the contestants with two difficult challenges: a 15-minute meal and his mushroom and spinach rotolo.

There's a catch to the flavour bombs that Jamie Oliver has left behind for the contestants to cook with. They will only be revealed 15 minutes into the cook and must be included in the dish.

Contestants must create the tastiest dish in 45 minutes using ingredients from Shannon Bennett's fridge. The winner then faces Hugh Allen of Vue de Monde to win an elusive immunity pin.

Poh Ling Yeow presents the season's first mystery box challenge. The contestants must create a winning dish with basic staples and little other ingredients.

Emelia Jackson, former MasterChef winner and the master of cooking desserts, shares some secret tips with the contestants. To save themselves from elimination, the contestants must make a dish using Emelia's choux pastry recipe.

The cooks compete in the first Service Challenge of the season. Two teams, aided by mentors Matt Sinclair and Sashi Cheliah, must cook an entrée and a main course dish for thirty diners.

Contestants must turn Andy's spit-roasted chickens into an incredible dish, with the winner cooking off for an immunity pin against Three Blue Ducks chef Darren Robertson.

Survival is on the menu as Julie Goodwin returns, with those who pick a wrong ingredient in Julie's seafood stew forced to battle it out to avoid elimination using only the items in Julie's recipe.

Living up to its name, the greatest Mystery Box in the history of MasterChef is unveiled during Big Week. To avoid the Pressure Test, competitors must think creatively and play with the flavour to win the round.