Ingredients: 
Gumbo Filling: 
1/2 cup vegetable oil 
1/2 cup all-purpose flour 
1 1/2 cups chopped onion 
1 1/2 cups chopped green bell pepper 
1 1/2 cups chopped celery 
6 cloves garlic, mashed 
1 tablespoon Creole seasoning 
4 cups cooked chicken cut into 1/2-inch pieces 
1 pound andouille or Polish sausage cut into 1/2-inch rounds 
6 cups chicken stock 
Buttermilk Biscuit Crust (see below) 
2 tablespoons melted butter