Preheat the oven to 325°F (165°C).
Prepare the herb butter by combining softened butter, rosemary, thyme, sage, garlic, salt, and black pepper in a bowl.
Pat the turkey dry with paper towels and place it in a roasting pan.
Gently lift the turkey skin and rub a generous amount of herb butter under the skin and over the outside of the turkey.
Season the cavity of the turkey with salt and pepper, and optionally fill it with aromatics like onion or lemon.
Roast the turkey in the preheated oven, brushing it every 30 minutes with the drippings or additional butter.
Roast until the internal temperature of the thickest part of the turkey reaches 165°F (75°C), about 3 to 4 hours.
Remove the turkey from the oven and let it rest for at least 20 minutes before carving.
While the turkey rests, make the gravy by whisking flour into the pan drippings over medium heat, then gradually adding broth.
Serve the turkey with gravy and fresh herbs for garnish.