Place the flank steak in the freezer for 15 minutes to firm up, then slice against the grain into very thin, bite-sized strips.
In a medium bowl, whisk together the coconut aminos, toasted sesame oil, grated pear, grated ginger, minced garlic, sea salt, and black pepper.
Add the beef strips to the marinade, tossing well to coat, and let marinate at room temperature for at least 15 minutes.
Heat a large cast-iron skillet or wok over medium-high heat until very hot.
Add the beef to the skillet in a single layer, working in batches if necessary, and sear for 2-3 minutes until the edges are browned and caramelized.
Remove the beef from the pan and set aside.
In the same skillet, add the cauliflower rice and sauté for 3-4 minutes until tender and slightly golden from the residual pan juices.
Divide the cauliflower rice into bowls, top with the bulgogi beef, and serve alongside the kimchi.
Garnish with sliced scallions and toasted sesame seeds before serving.