Place the flank steak in the freezer for 15 minutes to firm up, then slice it against the grain into very thin strips.
In a medium bowl, whisk together the tamari, toasted sesame oil, raw honey, grated fresh ginger, minced garlic, sea salt, and black pepper.
Add the beef strips to the marinade, tossing well to coat, and let sit for at least 15 minutes at room temperature.
Heat a large cast-iron skillet over high heat until very hot, then add the beef in a single layer, searing for 1-2 minutes per side until caramelized and tender.
Remove the beef from the skillet and set aside; in the same pan, add the sliced carrots and baby bok choy, sautéing for 3 minutes until crisp-tender.
In a separate small pan or microwave-safe bowl, lightly steam the cauliflower rice until heated through.
Plate the cauliflower rice, top with the sautéed vegetables and beef bulgogi, and garnish with sesame seeds and red pepper flakes.