Disneyland's Blue Bayou Gumbo

roux (¼ cup room-temperature butter and ¼ cup flour - see note and instructions)

(2 medium) yellow onions, cut into ¼-inch dice

celery, cut into ¼-inch dice

chicken stock

cut okra

meat (chicken and/or andouille sausage and/or shrimp)

diced tomatoes

white pepper AND 1/3 teaspoon cayenne pepper (OR 1 tsp. cajun seasoning replaces both)

gumbo file

salt, divided use (OR to taste)

cooked rice

optional: 2 tablespoons olive oil, divided use

optional: ¾ pound green bell pepper, cored, seeded, cut into ¼-inch dice

optional: 1 tablespoon minced garlic

optional: 2 tablespoons freshly chopped parsley