
Rich, glossy, and deeply aromatic, this classic French emulsion sauce is built on a silky base of clarified butter and egg yolks, brightened by a sharp white wine and vinegar reduction and finished with fresh tarragon and optional chervil. The flavor is bold and herbaceous — the kind of sauce that makes a simple steak or roasted vegetables feel genuinely special. Because every ingredient here is straightforward and plant- or dairy-based, there's no need to scrutinize labels for hidden poultry-derived stocks or flavor enhancers that sometimes sneak into shortcut versions. The technique is the star: clarifying the butter removes the milk solids and gives the sauce its characteristic richness and stability, while whisking the yolks over a gentle bain-marie ensures a safe, food-thermometer-verified 160°F before the butter ever goes in. Taking your time with that first drizzle of butter — drop by drop — is what locks in the emulsion and keeps everything from breaking. Once it comes together, you'll have a velvety, restaurant-worthy sauce that holds beautifully for up to thirty minutes over warm water, ready to pour the moment dinner hits the table.
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Combine the white wine, white wine vinegar, minced shallots, roughly chopped tarragon, and cracked black pepper in a small saucepan over medium heat. Bring to a simmer and cook until the liquid is reduced to about 2 tbsp, 5–7 minutes. Strain through a fine-mesh strainer into a heatproof bowl, pressing on the solids to extract all the liquid; discard the solids. Let the reduction cool for 2–3 minutes until no longer steaming.
Melt the butter in the small saucepan over medium-low heat, then increase the heat slightly and cook until the foam subsides and the milk solids settle to the bottom, about 5 minutes. Skim off any foam from the surface. Carefully pour the clear golden butter into a liquid measuring cup or small pitcher, leaving the white milk solids behind in the pan; discard the solids. Keep the clarified butter warm.
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