01 - Set oven temperature to 320°F (160°C).
02 - Remove excess fat from inside the duck cavity and pat dry with paper towels.
03 - Combine five-spice powder, sea salt, and black pepper; rub evenly over the entire duck, including the cavity interior.
04 - Fill the duck cavity with crushed garlic, sliced ginger, and scallion pieces.
05 - Place the duck breast-side up on a wire rack set inside a roasting pan and roast for 60 minutes.
06 - Whisk together soy sauce, honey, and rice vinegar in a small bowl.
07 - Raise oven temperature to 430°F (220°C). Brush the duck with the honey-soy glaze.
08 - Return duck to oven and roast an additional 20 to 30 minutes, brushing once more halfway through until skin is deep golden and crisp.
09 - Remove from oven and allow to rest for 10 minutes before carving.
10 - Slice duck and serve with Mandarin pancakes or steamed buns, julienned cucumber, scallions, and hoisin or plum sauce.