Empty the Freezer Gumbo

Name: Empty the Freezer Gumbo
Ingredients: * 1 tablespoon plus 1/2 cup vegetable oil; * 1 pound smoked sausage, such a andouille or kielbasa, cut crosswise; into thick piece; * 4 pound chicken thigh, skin removed; * 1 tablespoon essence (recipe below) or other creole seasoning mix; * 1 cup unbleached all purpose flour; * 2 cup chopped onion; * 1 cup chopped celery; * 1 cup chopped bell pepper; * 1 teaspoon kosher salt; * 1/4 teaspoon cayenne; * 3 bay leaf; * 9 cup chicken stock or canned low sodium chicken broth; * 1/2 cup chopped green onion; * 2 tablespoon chopped parsley leaf; * 1 tablespoon filé powder