
Rich, velvety, and deeply aromatic, this classic French emulsion sauce is the kind of thing that turns a simple steak or roasted vegetables into something genuinely special. The flavor comes from a sharp reduction of dry white wine, white wine vinegar, shallots, and fresh tarragon — all cooked down to a concentrated two-tablespoon base before the real magic begins. Clarified butter gets whisked in drop by drop over a gentle double boiler, building a sauce so silky and thick it coats the back of a spoon in the most satisfying way. Fresh tarragon folded in at the end keeps the finish bright and herbaceous rather than heavy. For anyone avoiding caffeine, every single ingredient here is naturally free of it — no tea, coffee, chocolate, or hidden additives anywhere in the process, just pure classical technique and clean pantry staples. The double-boiler method and the use of pasteurized egg yolks also mean you get a food-safe result without sacrificing that luscious, restaurant-quality texture. It takes a little patience and a steady whisking arm, but the payoff is absolutely worth it.
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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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