01 - Set the oven to 350°F (fan assisted, gas mark 4) to prepare for roasting.
02 - In a small bowl, mix softened butter with parsley, thyme, rosemary, lemon zest, and minced garlic until well combined.
03 - Pat the turkey crown dry with paper towels. Gently loosen the skin with your fingers and spread half of the herb butter beneath it; rub the remaining butter evenly over the skin.
04 - Rub the turkey crown all over with olive oil, then season thoroughly with sea salt and freshly ground black pepper.
05 - Place lemon halves, quartered onion, chopped carrots, and celery at the base of a large roasting tray. Position the turkey crown breast side up on top of the vegetables.
06 - Pour 1 cup of chicken stock into the roasting tray to maintain moisture during cooking.
07 - Cook for 1 hour 45 minutes, basting the turkey every 30 minutes with pan juices. If the skin browns too quickly, cover loosely with foil to prevent burning.
08 - Verify the thickest part of the breast reaches an internal temperature of 165°F using a meat thermometer to ensure proper cooking.
09 - Remove turkey from oven and rest loosely covered with foil for 20 minutes to allow juices to redistribute before slicing.