Preheat your oven to 400°F and line a small baking sheet with parchment paper.
In a small bowl, whisk together the honey, tamari, hoisin sauce, sesame oil, Chinese five spice, minced garlic, and grated ginger to create the glaze.
Season the pork tenderloin evenly on all sides with sea salt and black pepper.
Place the pork on the prepared baking sheet and brush generously with half of the honey-glaze.
Roast for 20 to 25 minutes, or until the internal temperature reaches 145°F, brushing with the remaining glaze halfway through the cooking time.
While the pork rests, steam the baby bok choy for 3 to 5 minutes until the stalks are tender-crisp and the leaves are bright green.
Slice the pork into thick medallions and serve immediately alongside the steamed bok choy, garnished with thinly sliced green onions.