In a small mixing bowl, whisk together the honey, tamari, hoisin sauce, toasted sesame oil, five spice powder, grated ginger, minced garlic, sea salt, and black pepper.
Place the pork tenderloin in a shallow glass dish or reusable silicone bag and pour the marinade over it, turning to coat all sides evenly.
Allow the pork to marinate in the refrigerator for at least 20 minutes, or up to 4 hours for deeper flavor development.
Preheat your oven to 400°F (200°C) and line a small baking sheet with parchment paper.
Transfer the pork to the baking sheet and roast for 20 to 25 minutes, basting with the remaining marinade halfway through, until the internal temperature reaches 145°F.
While the pork rests for 5 minutes, lightly steam the baby bok choy in a steamer basket over boiling water until the stems are tender-crisp.
Slice the pork tenderloin into thin medallions and serve immediately over the warm jasmine rice with the steamed bok choy on the side.