Lemon-Mustard Sauce

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   ["In a heavy-based medium saucepan, melt butter.", "Add flour all at once.", "Cook, stirring constantly, for 3 minutes.", "Add stock all at once.", "Blend mixture with a whisk.", "Cook mixture over low heat for 5 or 6 minutes, stirring often.", "Gently beat in egg yolks and add lemon juice, whisking constantly.", "Add mustard and mix.", "Add salt.", "Cook 1 or 2 minutes longer. Add cayenne pepper a little at a time, stirring and tasting until desired degree of ""heat"" is achieved."]

* Per serving · 4 servings · Values may vary.

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