Preheat oven to 375 degrees F.
Begin by placing the duck breast side up on a baking rack. Season with the salt and pepper, and roast until the juices run barely pink, about 45 minutes. Remove the duckling from the pan and set it aside.
Degrease the pan drippings by skimming off the top layer.
To prepare the sauce, combine the sugar and water and caramelize carefully. Add the wine, vinegar, orange juice and ginger. Mix them well and reduce by half. Add the stock and bring to a boil. Add the pan drippings, reduce the heat and simmer until sauce reduces by half. Once sauce is done, strain it through a cheesecloth or fine strainer and set aside.
To serve, place the duckling on a large serving tray. Add the orange segments on top and around the duck, and pour the sauce over the duck.