Parsley Mustard Sauce For Corned Beef - cooking recipe

Ingredients

2 tablespoons butter
2 teaspoons finely chopped yellow onions
2 tablespoons flour
3/4 cup milk
3/4 cup beef stock (or cooking liquid from corned beef)
1 tablespoon chopped fresh parsley
1 teaspoon hot English mustard
1/8 teaspoon nutmeg
salt & freshly ground black pepper

Preparation

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