In 1 quart measuring cup, blend together oil and flour. Cook in microwave on high 7 minutes. Stir - cook 2 minutes longer. Add onions and celery and garlic. Cook on high 3 minutes. Pour into 4 quart casserole. Stir in shrimp water and seasonings. Cook on high 12 minutes. Add green onions and parsley. Cook on high 2 minutes. Serve over rice.
Cajun Country -- New Iberia, Louisiana