This is my favourite sauce for corned beef.
Make and share this Parsley Mustard Sauce for Corned Beef recipe from Food.com.
- 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.