Spinach Gumbo

Name: Spinach Gumbo
Ingredients: 2 pounds chicken thighs and drumsticks; Kosher salt; Freshly ground black pepper; 1 tablespoon vegetable oil; 12 ounces andouille sausage or kielbasa, sliced; 3 tablespoons bacon fat or unsalted butter; 1/2 cup all-purpose flour; 1 onion, chopped; 1 green bell pepper, chopped; 3 stalks of celery, chopped; 6 cups chicken stock or low sodium chicken broth; 4 cups water; 3/4 cup white rice; 6 ounces baby spinach