
Béarnaise is one of those sauces that feels like a luxury, and this classic version absolutely delivers — glossy, rich, and perfumed with fresh tarragon and a bright hit of lemon. The technique starts with a sharp reduction of white wine vinegar, dry white wine, shallots, and tarragon, which gives the finished sauce its signature depth before a single drop of butter goes in. From there, pasteurized egg yolks are whisked over a gentle bain-marie until thick and silky, then the warm clarified butter is streamed in slowly until everything comes together in that unmistakable, velvety emulsion. Because the ingredient list is built entirely around butter, eggs, wine, herbs, and aromatics, there is nothing here to worry about for anyone avoiding fungi — no broths, no umami boosters, no hidden extras that could complicate things. Optional chervil adds a delicate anise note if you have it on hand, but the tarragon alone is more than enough to make this sauce sing. It is the kind of thing that turns a simple steak or roasted vegetables into a proper occasion, and once you nail the technique, you will find yourself reaching for it constantly.
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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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