Gravy for Simple Grill-Roasted Turkey | America's Test Kitchen

Ingredients

• 1 tablespoon vegetable oil
• Reserved turkey neck , cut into 1-inch pieces, and giblets
• 1 pound onions , chopped coarse
• 4 cups low-sodium chicken broth
• 4 cups beef broth
• 2 small carrots , peeled and chopped coarse
• 2 small celery ribs , chopped coarse
• 6 tablespoons unsalted butter
• 1/2 cup all-purpose flour
• 2 bay leaves
• 1/2 teaspoon dried thyme
• 10 whole black peppercorns