Set the pork fat side up in a large roasting pan. Add the halved garlic, orange zest strips, soy sauce, brandy, scallions, sugar and the remaining 1 teaspoon of five-spice powder to the pan along with 1 1/2 cups of water. Bake for 15 minutes, then lower the oven temperature to 325° and bake for 45 minutes, basting twice. Cover the pan with foil and bake for 1 1/2 hours, basting every 20 minutes. Uncover and bake for about 45 minutes longer, basting twice, until the pork is richly glazed and an instant-read thermometer inserted in the thickest part registers 175°. Transfer the pork to a carving board, cover with foil and let rest for 15 minutes.