Turkey Neck Gumbo Over Rice

Name: Turkey Neck Gumbo Over Rice
Ingredients: ½ cup (120 ml) vegetable or canola oil; 3 cups (420 g) finely diced onion; 3 cups (360 g) finely diced green bell peppers; 3 cups (360 g) finely diced red bell peppers; 3 cups (360 g) finely diced celery; 3 Tbsp. minced garlic; 18 turkey necks; 1 cup (140 g) all-purpose flour; 3 Tbsp. filé powder (available in specialty stores or online); 12 cups (2.8 L) chicken stock; 1 Tbsp. dried thyme; Kosher salt and freshly cracked black pepper; Hot sauce; Cooked white rice, for serving