
This silky French butter sauce gets a gorgeous autumnal twist from unfiltered apple cider and a splash of apple cider vinegar, building a bright, tangy base that makes the finished sauce taste far more complex than its short ingredient list suggests. The whole thing comes together with cold butter whisked in cube by cube over the gentlest heat, creating that signature creamy, opaque texture that clings beautifully to whatever it touches. Because the recipe is built entirely around butter, fresh cider, shallot, and thyme, it's naturally free from any red meat or red meat-derived ingredients — no stocks, no drippings, no hidden animal fats to second-guess. Spooned over pan-seared fish, roasted chicken, or a pile of tender vegetables, it elevates a simple weeknight plate into something that feels genuinely restaurant-worthy. The optional chives scattered over the top add a pop of color and a mild oniony finish that ties the whole dish together. The key technique here is patience — low heat and constant whisking keep the emulsion stable and the sauce glossy rather than greasy. Once you nail it, this becomes the kind of sauce you'll want to drizzle over everything.
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Combine the apple cider, apple cider vinegar, minced shallot, thyme sprig, and salt in a small saucepan over medium heat. Bring to a simmer and cook until the liquid has reduced to about 2 tablespoons and the shallot is very soft, 8–10 minutes.
Remove the thyme sprig and discard it. Pour the reduction through a fine-mesh strainer into a small bowl, pressing the shallot solids to extract all the liquid, then discard the solids. Return the strained reduction to the saucepan over the lowest heat setting.
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