Bearnaise Sauce

n. sauce very similar to the hollandaise but made with white wine (instead of lemon juice) and tarragon and shallots

Bearnaise sauce (French: Sauce béarnaise) is a sauce of clarified butter and egg yolks flavored with tarragon and shallots, with chervil and tarragon simmered in vinegar to make a reduction. "A Béarnaise sauce is simply an egg yolk, a shallot, a little tarragon vinegar, and butter, but it takes years of practice for the result to be perfect," wrote the restaurateur Fernand Point (1897-1955) in Ma Gastronomie. It is a traditional sauce for steak.
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SALSA BEARNESE