01 - Set the oven to 350°F (180°C) with fan or gas mark 4.
02 - In a small bowl, blend softened butter with parsley, thyme, rosemary, lemon zest, and minced garlic until well combined.
03 - Pat the turkey crown dry using paper towels. Gently loosen the skin and spread half of the herb butter underneath. Rub the remaining butter evenly over the surface of the skin.
04 - Coat the turkey crown with olive oil, then sprinkle with sea salt and freshly ground black pepper evenly on all sides.
05 - Place lemon halves, quartered onion, chopped carrots, and celery sticks in a large roasting tray. Position the turkey crown breast side up over the vegetables.
06 - Pour 1 cup of chicken stock into the base of the roasting tray to keep vegetables moist and enhance flavor.
07 - Cook in the oven for 1 hour and 45 minutes. Baste with pan juices every 30 minutes. If the skin browns too rapidly, cover loosely with aluminum foil.
08 - Insert a meat thermometer into the thickest part of the breast; it should register 165°F (74°C) for safe consumption.
09 - Remove turkey from oven and cover loosely with foil. Allow it to rest for 20 minutes before slicing to retain juices.