In a medium bowl, combine the butter, lemon zest, chopped rosemary, chopped sage, chopped thyme, and kosher salt.
Place the turkey breast in a roasting pan fitted with a roasting rack. Pat dry with paper towels. Rub the butter mixture all over the turkey. Sprinkle additional salt in the cavity.
Place in the preheated oven and cook for 30 minutes.
Reduce the oven temperature to 375°F and continue to cook for another 75–90 minutes, or until the turkey reaches 155°F with a meat thermometer inserted in the thickest part. Check the turkey after 60 minutes has passed—you may need to cover it with a piece of foil to prevent the turkey from browning too much. If the turkey looks very golden brown, loosely place a piece of foil over the top of the turkey until it has completed cooking.