
Rich, glossy, and deeply aromatic, this French butter sauce is the kind of thing that turns a simple steak or poached fish into a restaurant-worthy plate. The base is a sharp reduction of white wine vinegar, dry white wine, shallots, and fresh tarragon — simmered down until concentrated and intensely fragrant before the egg yolks ever hit the bowl. From there, warm clarified butter gets whisked in drop by drop until the sauce transforms into something silky and luxurious that clings beautifully to everything it touches. Fresh tarragon stirred in at the finish keeps the flavor bright and herbaceous rather than heavy. For anyone navigating a celery allergy or sensitivity, this classic recipe is naturally free of the ingredient without any substitutions required — every component is straightforward and easy to verify. The double-boiler technique and the food-safety step of bringing the yolks to 160°F mean you're getting both the proper texture and peace of mind in the same pan. Make it just before serving and it's honestly one of the most impressive sauces you can pull off at home.
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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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