Shrimp Andre'

• 36 shrimp (cleaned)
• 1 lemon
• 350 ml mornay sauce
• 120 ml sherry juice
• 65 gr mushrooms (fresh sliced)
• 45 gr butter
• 30 gr onions (chopped)
• 2 gr thyme (whole)
• 2 gr parsley (chopped)
• 1 gr garlic powder