Preheat your oven to 400°F and line a small baking sheet with parchment paper for easy cleanup.
In a small mixing bowl, whisk together the honey, tamari, hoisin sauce, toasted sesame oil, Chinese five-spice, and beet powder until smooth.
Place the pork tenderloin in a shallow dish and coat it thoroughly with two-thirds of the prepared marinade, setting the remaining third aside for later glazing.
Transfer the pork to the baking sheet and roast for 20 to 25 minutes, or until the internal temperature reaches 145°F.
Halfway through the roasting time, brush the reserved marinade over the pork to create a thick, sticky glaze.
While the pork rests for 5 minutes, mince the garlic and finely grate the fresh ginger.
Heat the avocado oil in a large skillet over medium-high heat, then add the garlic and ginger, sautéing for 30 seconds until fragrant.
Add the baby bok choy and sea salt to the skillet, tossing frequently for 2 to 3 minutes until the leaves are wilted but the stems remain bright and crisp.
Slice the roasted pork into half-inch medallions and serve immediately alongside the sautéed greens.