How to Make It
In a small skillet, melt the butter. Stir in the flour and cook over moderately low heat, stirring often, until the mixture turns a rich, dark brown, 11/2 hours. Transfer the roux to a bowl and refrigerate until cold.
Meanwhile, in a large skillet, heat the oil. Add the breasts, skin side down, and cook over moderately high heat until browned, 7 minutes. Pour off the fat, reserving 2 tablespoons. Turn the breasts and brown the other side, 3 minutes. Transfer to a rimmed baking sheet. Repeat with the goose legs.
In a large enameled cast-iron casserole, heat the reserved 2 tablespoons of goose fat. Add the andouille, garlic, celery, jalapeños, onion and bell pepper and cook over moderate heat, stirring, until the vegetables are softened, 10 minutes. Add the bay leaf, oregano, thyme, paprika and cayenne and cook, stirring, for 4 minutes. Add the wine and boil until reduced by half, 2 minutes. Add the broth and water and bring to a boil. Add the goose parts and simmer over low heat, skimming occasionally, until the goose is tender, 11/2 hours. Transfer the goose to the baking sheet and let cool to room temperature. Discard the skin and bones and cut the meat into bite-size pieces.
Whisk in 1 cup of the hot gumbo liquid into the cold roux. Whisk this mixture into the gumbo and bring to a simmer, stirring often. Simmer the gumbo over low heat for 15 minutes, stirring occasionally. Return the goose meat to the gumbo and bring to a simmer. Add the scallions and parsley, season with salt and black pepper and serve.
Goose parts are available from Schiltz Foods (roastgoose.com).