
Rich, velvety, and deeply aromatic, this classic French emulsion sauce is built entirely from butter, egg yolks, fresh herbs, and a sharp wine-and-vinegar reduction — not a trace of gelatin or any animal-derived thickener in sight. That matters more than you might think, since many store-bought or restaurant versions of creamy sauces sneak in stabilizers that aren't always clearly labeled. Here, the silky body comes purely from the science of emulsification: clarified butter whisked slowly into warm, thickened egg yolks until the whole thing becomes impossibly smooth and glossy. The tarragon-forward reduction is what sets this sauce apart from a plain hollandaise — that bright, slightly anise-like herb note cuts right through the richness and makes every bite feel intentional. Cooking the yolks to 160°F over a double boiler keeps things food-safe without compromising that luscious, spoonable texture. A pinch of cayenne and optional chervil round out the flavor in a way that feels restaurant-worthy but is absolutely achievable at home. Spoon it over steak, roasted vegetables, or poached fish and prepare for it to become your most-requested finishing sauce.
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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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