
Rich, velvety, and deeply aromatic, this classic French emulsion sauce is built from a handful of clean, naturally grain-free ingredients — butter, egg yolks, fresh herbs, and a sharp white wine reduction. For anyone navigating a rye-free lifestyle, sauces can be a surprising minefield, with thickeners and flavor bases sometimes hiding unwanted grains. This one sidesteps all of that entirely: there's no flour, no starch, no filler — just clarified butter whisked into silky egg yolks over a gentle double boiler. The tarragon-and-shallot reduction is where the magic really starts, layering in a bright, slightly anise-forward depth that makes the finished sauce taste far more complex than its ingredient list suggests. A pinch of cayenne and optional chervil round out the flavor without overwhelming the herbal backbone. It's the kind of sauce that turns a simple steak or roasted vegetable into something genuinely special, and knowing exactly what went into every drop makes it taste even better.
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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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