For the duck: Preheat the oven to 250 degrees F. Place the duck legs in a 9-by-13-inch baking pan, cover the legs with duck fat and add the star anise. Cover the baking pan with foil. Cook until the meat is able to pull away from the bone but also stays intact, 4 hours.
To serve, place the duck skin-side down on a griddle or sautee pan over medium heat for until the skin is crispy and golden, 4 to 5 minutes.
For the glaze: While the duck is in the oven, prepare the sauce. In a medium saucepan, mix the orange juice, sugar, vinegar, soy sauce, ginger and star anise. Bring to a simmer for 5 minutes. Allow to cool, and then strain.
To serve, reduce the glaze by half over medium-high heat, it should get thick and sticky.
Pour the reduced sauce onto the crispy duck legs. Serve immediately.
This recipe was provided by a chef, restaurant or culinary professional. It has not been tested for home use.