Ingredients:

• 1 gallon water, divided
• 1 cup (225g) kosher salt
• 1 bunch Italian parsley, approximately 15 stems
• 1 yellow onion, sliced
• 1 head garlic, cut in half crosswise
• 2 oranges, halved
• 1/4 cup black peppercorns, crushed with heavy pan or pulsed in spice grinder
• 1 (12- to 18-pound) whole turkey, neck, giblets, heart, and liver removed