Preheat your oven to 400°F (200°C).
Score the duck breast skin in a crosshatch pattern using a sharp knife, being careful not to cut into the meat.
Season both sides of the duck breast evenly with the five spice powder and sea salt.
Place the duck breast skin-side down in a cold oven-safe skillet, then turn the heat to medium to slowly render the fat for 8-10 minutes until the skin is golden.
Flip the duck breast over and transfer the skillet to the oven for 5-7 minutes until the internal temperature reaches 135°F for medium-rare.
While the duck rests on a cutting board, steam the baby bok choy and broccoli florets for 4-5 minutes until they are bright green and tender-crisp.
In a small bowl, whisk together the tamari, grated fresh ginger, minced garlic, and toasted sesame oil to create the dressing.
Thinly slice the duck breast against the grain and serve it over the steamed vegetables, drizzling the ginger-tamari sauce over the top.