Preheat your oven to 400°F.
Make the stuffing by combining Italian sausage, bacon, crumbled roasted chestnuts, chopped green olives, and dried sage in a bowl. Start with 1 teaspoon each of sea salt and freshly ground black pepper, and adjust seasoning to taste.
½ lb Italian sausage, 4 slices bacon, 1 cup roasted chestnuts, ½ cup green olives, 2 teaspoon dried sage, Sea salt and freshly ground black pepper
Use your fists to flatten the turkey breast as best as possible, and rub some cooking fat over it.
2 tablespoon cooking fat, 4 lb boneless turkey breast
Place the turkey breast skin side down on a baking dish and spread the stuffing on top. Roll the breast around the stuffing and secure it with butcher’s twine.
Season the stuffed breast all over with sea salt and freshly ground black pepper to taste.
Bake the stuffed turkey breast for about 1 hour, or 14 minutes per pound, until it reaches an internal temperature of 165°F. Add more sea salt and freshly ground black pepper to taste.
Let the turkey rest for 10 minutes before cutting the twine and serving with the cooking juices. Adjust seasoning with sea salt and freshly ground black pepper as desired.