
Béarnaise is the kind of sauce that turns a simple steak or roasted vegetable into something genuinely special — glossy, rich, and perfumed with fresh tarragon in a way that feels almost luxurious. Many classic French mother-sauce variations sneak in warming spices during preparation, but this version keeps things clean, relying entirely on a sharp white wine and vinegar reduction, shallots, and bright herbs to build its depth. The technique is the real star here: a careful double-boiler emulsion that coaxes egg yolks and clarified butter into a velvety, spoon-coating consistency that holds beautifully. Using pasteurized yolks and whisking to a safe internal temperature means you get that silky texture without cutting corners on food safety. Fresh tarragon does the heavy lifting on flavor, with optional chervil adding a delicate, anise-like finish that feels elegant without being fussy. It takes patience and a steady hand with the butter stream, but the payoff — a sauce this smooth and aromatic — is absolutely worth it.
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Clarify the butter: melt the butter in a small saucepan over low heat until the milk solids sink and the foam subsides, about 8–10 minutes. Skim the foam from the surface, then carefully pour the clear golden liquid into a heatproof measuring cup, leaving the white milk solids behind. Keep warm.
Make the reduction: combine the white wine vinegar, white wine, shallots, roughly chopped tarragon, and cracked black pepper in the small saucepan over medium heat. Simmer until the liquid is reduced to about 2 tablespoons, 4–5 minutes. Strain through a fine-mesh strainer into a heatproof bowl, pressing the solids to extract all the liquid; discard the solids.
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