Preheat your oven to 400°F and line a rimmed baking sheet with parchment paper.
In a small mixing bowl, whisk together the coconut aminos, honey, sesame oil, five spice powder, garlic powder, ginger powder, beet powder, and sea salt to create the marinade.
Place the pork tenderloin in a shallow dish and pour the marinade over it, turning to coat all sides thoroughly; let it marinate for at least 15 minutes.
Transfer the pork to the prepared baking sheet and roast for 20 to 25 minutes, or until the internal temperature reaches 145°F.
While the pork is roasting, steam the baby bok choy in a steamer basket over boiling water for 3 to 5 minutes until the stalks are tender.
Heat a non-stick skillet over medium heat and sauté the cauliflower rice for 5 minutes until softened and slightly toasted.
Remove the pork from the oven and let it rest for 5 minutes before slicing into thick medallions.
Serve the sliced pork over the cauliflower rice with the steamed bok choy on the side, garnishing with sesame seeds.