Chicken Divan Casserole

• 6 black peppercorns (whole)
• 3 sprigs parsley (fresh)
• 1 bay leaf
• 1,400 ml water
• 475 gr broccoli spears (frozen)
• 400 gr chicken breast (halves)
• 120 ml evaporated skim milk
• 45 ml cooking sherry
• 30 ml corn oil margerine
• 20 gr parmesan cheese (grated)