
Rich, velvety, and deeply aromatic, this classic French emulsion sauce is the kind of thing that turns a simple steak or roasted asparagus into a full-on occasion. The base is a sharp, fragrant reduction of dry white wine, white wine vinegar, shallots, and fresh tarragon — and that herby backbone is what makes it taste so alive. Clarified butter gets whisked in drop by drop over a gentle double boiler until the sauce builds into something impossibly silky and thick. Because every single ingredient here is straightforward and plant- or dairy-based, there's nothing lurking in the background to worry about — no fungi, no fillers, just clean, classic components. The technique is the star: patience with the butter pour and steady whisking are what separate a broken sauce from a glossy, spoonable dream. Fresh tarragon stirred in at the finish keeps the flavor bright rather than heavy, and a pinch of cayenne gives it just enough edge. Once you've nailed the emulsion, you'll want to drizzle this over everything.
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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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