béarnaise sauce

noun

bé·​ar·​naise sauce ˈbā-ər-ˌnāz- 

-är-;

ˈber- 

: a sauce of egg yolks and butter flavored with shallots, wine, vinegar, and seasonings

Word History

Etymology

French béarnaise, feminine of béarnais of Béarn, France

First Known Use

1869, in the meaning defined above