|Place of origin||France|
|Main ingredients||Egg yolk, clarified butter, white wine vinegar|
Béarnaise sauce (//; 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 widely regarded as the "child" of the Hollandaise sauce.  The difference is only in the flavoring: Béarnaise uses shallot, chervil, peppercorns, and tarragon in a reduction of vinegar and wine, while Hollandaise is made of a reduction of lemon juice or white wine vinegar, with white peppercorns and a pinch of cayenne instead of the above seasonings.
The sauce was accidentally[dubious ] invented by the chef Jean-Louis Françoise-Collinet, the accidental inventor of puffed potatoes (pommes de terre soufflées), and served at the 1836 opening of Le Pavillon Henri IV, a restaurant at Saint-Germain-en-Laye, not far from Paris. This assumption is supported by the fact that the restaurant was in the former residence of Henry IV of France, a gourmet himself, who was from Béarn, a former province now in the department of Pyrénées-Atlantiques, in southwestern France.
A Béarnaise sauce is simply clarified butter, an egg yolk, a shallot, a little tarragon vinegar. It takes years of practice for the result to be perfect. – Fernand Point 
As with Hollandaise sauce, there are several methods for preparing of Béarnaise sauce. The most common uses a bain-marie (whisking to a temperature of 150F (65.6C)), where a reduction of vinegar is used to acidulate the yolks. Escoffier calls for a reduction of wine, vinegar, shallots, fresh chervil, fresh tarragon and crushed peppercorns (later strained out), with fresh tarragon and chervil to finish instead of lemon juice. Others are similar.
Alternatively, the flavorings may be added to a finished Hollandaise (without lemon juice). Joy of Cooking describes a blender preparation with the same ingredients.
- Sauce Choron or sauce Béarnaise tomatée is a variation of béarnaise without tarragon or chervil, but with added tomato purée. It is named after Alexandre Étienne Choron.
- Sauce Foyot (also known as Valois) is béarnaise with meat glaze (glace de viande) added.
- Sauce Colbert is Sauce Foyot with the addition of reduced white wine.
- Sauce Paloise is a version of béarnaise with mint substituted for tarragon.
- The family is sometimes referred to as "mayonnaise sauces" as they are, like mayonnaise, based on the emulsion of an oil in egg water.
- Escoffier: 89
- Julia Child
- "La sauce béarnaise". 16 May 2015.
- "What is Bearnaise sauce? | Cookthink". Archived from the original on 2009-06-02. Retrieved 2010-03-08.
- Restaurateur Fernand Point (1897–1955) in Ma Gastronomie.
- "How to Make Hollandaise | A French Mother Sauce | Stella Culinary".
- Cookwise, pp.304-5
- Joy of Cooking p.359
- Escoffier: 90
- Escoffier: 91
- Escoffier: 41
- Escoffier: 141
- Child, Julia; Louisette Bertholle; Simone Beck (1961). Mastering the Art of French Cooking. New York: Knopf.
- Corriher, Shirley (1997). "Ch. 4: sauce sense". Cookwise, the Hows and Whys of Successful Cooking (1st ed.). New York: William Morrow & Company, Inc. ISBN 0688102298.
- David, Elizabeth (1960). French Provincial Cooking. Penguin. ISBN 978-0-14-118153-0.
- Escoffier, Auguste (1982) [Trans. fm 4th French (Flammarion) ed. 1921]. "Ch. 1: Sauces". La Guide Culinaire [The Complete Guide to the Art of Modern Cookery] (in French). English translation by H.L. Cracknell and R.J. Kaufmann (First American ed.). New York: Mayflower Books. ISBN 0-8317-5478-8.
- Rombauer, Irma S.; Rombauer Becker, Marion (1975). Joy of Cooking. New York: The Bobbs-Merrill Company, Inc. (MacMillan). ISBN 0-02-604570-2.