Grouper With Spicy Mustard Sauce

• 4 from heat (inches)
• 2 chives
• 1 grouper
• 60 ml mayonnaise dressing
• 30 ml skim milk
• 30 ml lemon juice
• 10 ml dijon-style mustard
• 9 gr capers
• 2 gr parsley
• 1 gr black pepper