Chicken and Sausage Jambalaya

Name: Chicken and Sausage Jambalaya
Ingredients: 5 1⁄2 lbs chicken pieces (drumsticks, thighs, and breast halves with skin and bones); 4 tablespoons vegetable oil; 1 1⁄2 lbs andouille sausages or 1 1⁄2 lbs other spicy smoked pork sausage, cut crosswise into 1/4 inch-thick slices; 3 medium onions, chopped; 2 celery ribs, chopped; 1 green bell pepper, chopped; 4 garlic cloves, finely chopped; 2 cups chicken stock or 2 cups broth; 1 1⁄2 cups water; 1 (16 ounce) can tomatoes with juice, drained and chopped; 1⁄4 teaspoon cayenne (optional); 2 1⁄2 cups long-grain white rice, rinsed and drained well; 1 cup thinly sliced scallion top