Crawfish Fettucine Or Monica

• 350 gr fettucini noodles cook
• 240 ml cream (heavy)
• 190 gr crawfish tales (peeled)
• 110 gr margarine
• 60 gr onion (chopped)
• 60 gr green onions (chopped)
• 50 gr celery (chopped)
• 14 gr parsley (chopped)
• 1 gr thyme
• 1 gr cayenne pepper