Instructions
- **Day 1: Prepare the Duck** – Pat the duck breasts completely dry with paper towels. Using a very sharp knife or razor blade, score the duck skin in a crosshatch pattern, being careful *not* to cut into the meat. The scoring should be deep – aim for cuts that reach the fat layer but not the muscle. This maximizes surface area for rendering.
- In a small bowl, combine the kosher salt, baking powder, and five-spice powder (if using). Rub this mixture *generously* all over the duck skin, ensuring it gets into the scores. Don't season the meat side.
- Place the duck breasts, skin-side up, on a wire rack set over a baking sheet. Leave uncovered in the refrigerator for 24-48 hours. This is crucial for drying out the skin.
- **Day 2: Roast the Duck** – Preheat your oven to 400°F (200°C) with the convection setting turned on. If your oven doesn't have convection, use 425°F (220°C) and consider rotating the baking sheet halfway through.
- Place the duck breasts, skin-side down, in a cold oven-safe skillet (cast iron is ideal). This allows the fat to render slowly as the oven heats up.
- Roast for 20-25 minutes, or until the skin is deeply golden brown and very crispy. The fat should be rendering out significantly.
- Flip the duck breasts and roast for another 5-8 minutes for medium-rare (internal temperature of 130-135°F / 54-57°C). Adjust cooking time for desired doneness.
- Remove from the oven and let rest for 10 minutes before slicing. This allows the juices to redistribute.
- **Optional Glaze:** While the duck rests, whisk together the hoisin sauce, rice vinegar, and honey in a small bowl. Brush the glaze over the sliced duck before serving.