
Beurre blanc is one of those classic French sauces that sounds intimidating but rewards patience with something genuinely luxurious. This version swaps the traditional white wine for fresh apple cider and a splash of cider vinegar, giving the finished sauce a subtle fruity brightness that plays beautifully against rich fish, roasted poultry, or simply prepared vegetables. The technique is all about low heat and cold butter — adding the cubes gradually while whisking keeps the emulsion creamy and opaque rather than greasy or broken. A quick strain after reducing the shallots keeps the texture silky smooth, and a handful of snipped chives at the end adds a little color and freshness. Every ingredient here is straightforward and naturally free from tree nut concerns, so there's no need to scrutinize labels or worry about unexpected additions. The result is an elegant, restaurant-worthy sauce that comes together with nothing more than a saucepan, a whisk, and a little attention.
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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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