Perfectly Roasted Turkey Breast

Name: Perfectly Roasted Turkey Breast
Ingredients: 1 large skin-on, bone-in turkey breast, about 7 lb. (3.5 kg); 2 Tbs. kosher salt; 8 large shallots, halved; 1 lb. (500 g) carrots, cut into 1-inch (2.5 cm) pieces on the diagonal; 2 heads garlic, top 1/2 inch (12 mm) cut off; 4 fresh rosemary sprigs, plus more for garnish; 4 fresh thyme sprigs, plus more for garnish; 4 fresh sage sprigs, plus more for garnish; 1 to 2 cups (8 to 16 fl. oz./250 to 500 ml) chicken or turkey broth; 8 Tbs. (1 stick) (4 oz./125 g) unsalted butter, at room temperature; Freshly ground pepper