Make-Ahead Flourless Turkey Gravy (Low-Carb)

Name: Make-Ahead Flourless Turkey Gravy (Low-Carb)
Prep time: 15 min
Cook time: 3 h
Total time: 3 h 15 min
Cuisine: American
Ingredients: 2 turkey wings ( or the neck and back from a spatchcocked turkey (about 2 pounds total for both)); 1/2 large head cauliflower (cut into 1-inch thick slices (about 1 pound)); 1/2 medium yellow onion; 1/2 head garlic (halved horizontally); 2 teaspoons extra-virgin olive oil; 2 teaspoons kosher salt (divided); 1/2 teaspoon freshly ground black pepper; 1/2 cup low-sodium chicken broth (or water); small sprig of fresh sage; small sprig of fresh thyme; 1 teaspoon Bells poultry seasoning