Step 1: Place the milk and finely chopped onion into a pan, bring to boiling point; reduce heat and simmer, uncovered for 5 minutes and remove from heat.
Step 2: On a medium heat ; add butter in a separate pan, on add flour & stir and cook until combined; remove pan from the heat add the milk and onion mix and stir until combined.
Step 3: Return pan to a heat and stir until sauce boils and thickens.
Step 4: Season with salt and pepper, add the nutmeg and mustard; mix well.
Step 5: Simmer very gently for 3 minutes; add parsley stirring until combined.
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