Rinse the duck and dry with paper towels. Rub with salt and pepper inside and out.
Mix the apple and orange slices and add cinnamon sticks. Tightly stuff the duck cavity and close off with toothpicks. Tie the legs with kitchen string. Make an incision in the breast to let the fat drip out better. Preheat oven to 160 degrees C.
Place the duck breast side up in a roasting tin. Place any leftover apples in the tin as well. Roast 2 1/2 -3 hours, depending on the size of the duck. After 1 1/2 hours, baste with the jam, which will make the skin golden.