1. Preheat your oven to 325°F or 160°C, getting it ready for the long roasting process ahead.

2. In a small bowl, blend the softened butter with flour, cinnamon, nutmeg, salt, and pepper until the mixture is well combined and fragrant.

3. Take the herb butter and rub it all over the turkey, making sure to slip some under the skin to infuse it with flavor.

4. Stuff the turkey cavity with the chopped onion and carrots for added flavor and moisture.

5. Place the turkey in a roasting pan and slide it into the oven, where it will roast to perfection.

6. Roast the turkey for about 4 to 4 1/2 hours, or until its internal temperature reaches a safe 165°F or 74°C.

7. While the turkey is roasting, start making the gravy. In a small saucepan, combine the turkey broth, heavy cream, Dijon mustard, and honey, then bring the mixture to a gentle simmer over medium heat.

8. Once the turkey is done roasting, remove it from the oven and let it rest for 20 to 30 minutes before carving. This allows the juices to redistribute, making the meat tender and juicy.

9. Strain the pan juices into the gravy, whisking until the mixture is smooth and free of lumps. Season with salt and pepper to taste, adjusting the flavor as you see fit.

10. Serve the beautifully roasted turkey with the tangy herb gravy spooned over the top, creating a truly unforgettable dining experience.