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Onion Mustard Sauce

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  1. 1 small onion, minced
  2. 1/2 cup dry white wine
  3. 1/2 cup heavy cream
  4. 2 tablespoons cold unsalted butter, cut into 4 pieces
  5. 1/4 cup whole-grain mustard
  6. Salt and freshly ground pepper
  1. In a small saucepan, combine the onion and white wine and simmer over moderate heat until the wine is reduced to 1 tablespoon, about 5 minutes. Add the heavy cream and bring to a boil. Transfer the mixture to a blender and puree. With the machine on low speed, add the butter, 1 piece at a time, until the sauce is smooth.
  2. Scrape the onion sauce into a small saucepan and stir in the mustard. Season with salt and pepper. Rewarm the sauce over low heat, stirring constantly. Serve the sauce warm.
Make Ahead The mustard sauce can be refrigerated overnight. Gently reheat, whisking constantly. Serve With Smoked Fish Cakes with Root-Vegetable Slaw.
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