Parsley Mustard Sauce for Corned Beef

Total Time
5 mins
10 mins

This is my favourite sauce for corned beef.

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  • 2 tablespoons butter
  • 2 teaspoons finely chopped yellow onions
  • 2 tablespoons flour
  • 34 cup milk
  • 34 cup beef stock (or cooking liquid from corned beef)
  • 1 tablespoon chopped fresh parsley
  • 1 teaspoon hot English mustard
  • 18 teaspoon nutmeg
  • salt & freshly ground black pepper


  1. Melt butter in a small saucepan over medium heat.
  2. Add onions and cook until just softened, about 1 minute.
  3. Whisk in flour and cook until light golden, about 1 minute.
  4. Whisk in beef stock, milk, parsley, mustard, and nutmeg and whisk until smooth.
  5. Season to taste with salt and pepper and cook, whisking, until thickened, 4–5 minutes.