Long Island Duckling Two Ways

Name: Long Island Duckling Two Ways
Ingredients: 2 medium Long Island ducks (4 to 5 pounds each), cut into serving pieces; 1 tablespoon grapeseed oil; 1 750-ml bottle dry red wine; 2 cups homemade or low-sodium canned chicken stock; Zest of 1 lemon; Zest of 1 orange; 1/2 teaspoon whole black peppercorns; 2 garlic cloves, crushed; Coarse salt and freshly ground pepper; 2 medium carrots, peeled and cut into 1/3-inch dice; 2 celery stalks, cut into 1/3-inch dice; 2 leeks, washed and cut into 1/3-inch dice; 1 medium onion, cut into 1/3-inch dice