pièce de résistance

 
Pronunciation: /ˌpjɛs də reɪˈzɪstɒ̃s, pjɛs də ʀezistɑ̃s/

noun

[in singular]
  • (especially with reference to creative work) the most important or remarkable feature: the pièce de résistance of the meal was flaming ice cream

Origin:

French, literally 'piece (i.e. means) of resistance'