cordon bleu
Concise Oxford English Dictionary © 2008 Oxford University Press:
cordon bleu /ˌkɔːdɒ̃ ˈbləː/
▶adjective (of cooking or a cook) of the highest class. ▶noun (pl. cordons bleus pronunc. same) a cordon bleu cook.
– origin C18: Fr., lit. ‘blue ribbon’ (once signifying the highest order of chivalry in the reign of the Bourbon kings).
'cordon bleu' also found in these Oxford entries:

