Oxtail Gumbo

Name: Oxtail Gumbo
Ingredients: 1⁄3 cup canola oil; 4 lb. beef oxtails, trimmed; Kosher salt and freshly ground black pepper, to taste; 1 lb. pork sausage; 3⁄4 cup flour; 2 tbsp. Creole seasoning; 1 tsp. crushed red chile flakes; 6 scallions, minced; 4 cloves garlic, minced; 2 stalks celery, minced; 1 large yellow onion, minced; 1 smoked turkey neck, cut into 2″ pieces; 8 cups chicken stock; Cooked white rice, for serving