Cajun Oyster Pie

• 1/4 file powder
• 475 ml oysters in their own juice
• 475 ml milk (hot)
• 65 gr green bell pepper (chopped)
• 50 gr celery (chopped)
• 20 gr butter
• 14 gr flour
• 6 gr pimiento (chopped)
• 5 ml tabasco sauce
• 3 gr salt