Béarnaise sauce

Bearnaise or Béarnaise sauce (/bɚrˈneɪz/, French: [be.aʁ.nɛz]) is a sauce made of clarified butter emulsified in egg yolks and white wine vinegar and flavored with herbs. It is considered to be a "child" of the mother Hollandaise sauce, one of the five sauces in the French haute cuisine mother sauce repertoire. The difference is only in the flavoring: Béarnaise uses shallot, chervil, peppercorn, and tarragon, while Hollandaise uses lemon juice or white wine. Its name is related to the province of Béarn, France.