While in New Orleans I bought "Cajun Cooking for Beginners" from a renowned cooking school. This recipe was the reason for that purchase. It turned out great so I have opted to share.
In a large heavy Dutch oven, combine the oil & flour over medium heat stirring constantly for about 25-30 minutes, to make a dark brown roux. This step didn't take me that long but for Gumbo it should ideally be a dark reddish brown, be very careful not to burn.
2
Add the onion, bellpepper & celery and cook, stirring often, for 6 to 8 minutes, or until veggies are soft.
3
Add the water/chicken stock & blend into the roux mixture.
4
Add the bay leaves & thyme.
5
Season the chicken with salt and cayenne.
6
Add the chicken to the roux-water mixture & simmer for 1 hour.
7
Add the andouille sausage & cook for 1 hour more, or until chicken is tender.
8
Skim off any oil that has risen to the surface. Remove the bay leaves.
9
Check seasonings. Add more salt & cayenne if necessary.
10
Add the green onion & parsley.
11
Serve immediately in soup bowls over steamed rice.
12
File powder can be passed around the table so that guests can add it to the gumbo according to individual tastes.