This episode's challenge is to tame one of these very prickly ingredients: chestnuts, stinging nettle, prickly pear or sea urchin. The best dish will win its maker immunity from the week's elimination.

Contestants cook from a rainbow mystery box including painted crayfish, scampi caviar, Fruit Loops, dragon fruit, coloured corn, mukhwas, flowering pineapple sage, rainbow chard, and dried turmeric.