Béarnaise sauce is a sauce made of clarified butter emulsified in egg yolks and white wine vinegar and flavored with herbs (Wikipedia, nd).
Béarnaise sauce contains a number of ingredients, including dairy products. Check the ingredients of the Béarnaise sauce carefully before consumption. In the event of an allergic reaction after consuming Béarnaise sauce, contact your allergist.
Béarnaise sauce is traditionally used as a topping for steak, although it can be used with any number of meats or dishes.
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Here is a basic Béarnaise sauce recipe!