Another recipe which fails to mention something important, in this case how much filé you use with each serving. I suppose you filé lovers know all about this already.

Make a roux: Heat fat on high heat, add flour and stir constantly, until flour is dark brown.

Remove roux from heat.
Add the onion, celery, salt, parsley, peppers and pepper.
Place back on low heat until vegetables are wilted.
Add 6 c. hot water and mix well to dissolve roux.
Cook on low heat about 30 minutes.
Add shrimp and crab.
Cook on slow heat for 30 minutes.
Remove from heat.
Just before serving add oysters.
Serve over steamed rice with filé sprinkled in bottom of bowl (do not cook filé).
This may be made with chicken, duck or many variations other than seafood.