01 - Heat the oven to 350°F on fan/gas mark 4.
02 - In a mixing bowl, combine softened butter with chopped parsley, thyme, rosemary, lemon zest, and minced garlic to create the herb butter.
03 - Pat the turkey crown dry with paper towels, carefully loosen the skin and spread half the herb butter underneath. Rub remaining butter evenly over the skin.
04 - Coat the turkey crown thoroughly with olive oil, then sprinkle sea salt and black pepper evenly all over.
05 - Arrange lemon halves, quartered onion, chopped carrots, and celery at the base of a roasting tray. Place the turkey crown breast side up on top.
06 - Pour chicken stock into the bottom of the roasting tray around the vegetables.
07 - Cook in the oven for 1 hour 45 minutes, basting every 30 minutes with pan juices. Cover loosely with foil if browning accelerates.
08 - Verify internal temperature at the thickest breast part reaches 165°F to ensure doneness.
09 - Remove from oven and let the turkey crown rest covered loosely with foil for 20 minutes before carving.