Turkey Roulade

Name: Turkey Roulade
Prep time: 45 min
Cook time: 1 h 45 min
Total time: 2 h 30 min
Cuisine: American
Ingredients: 2 medium stalks celery; 1 medium yellow onion; 1 medium sweet-tart apple, such as Honeycrisp or Gala; 3 cloves garlic; 2 tablespoons fresh parsley leaves, plus more for garnish; 1 tablespoon fresh sage leaves, plus more for garnish; 1 tablespoon fresh thyme leaves, plus more for garnish; 3 tablespoons unsalted butter, divided; 3 teaspoons kosher salt, divided; 8 ounces uncooked pork sausage; 4 ounces store-bought or homemade cornbread; 1 whole skin-on, boneless turkey breast (about 5 pounds); 1 cup low-sodium chicken broth; 2 tablespoons olive or vegetable oil; 1/4 teaspoon freshly ground black pepper