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. ---------------------------------------------------------------------------
Nutrition
Ingredients
