Brent Draper

Emotions run high with a semifinal spot at stake, as contestants feel the love in a tear-jerker of a mystery box. Hearts and souls will go into the contestants' versions of their family's favourite dish.

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

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

Contestants must choose one of three ingredients that have inspired the judges during their childhood, including Andy's Vegemite, Mel's kumquats or Jock's panettone.

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.

The lucky contestant to brew the perfect sweet coffee dish will move on to battle it out with the famous pastry chef from The Ritz-Carlton, Kay-Lene Tan, for a chance at the Immunity Pin.