In a small bowl, whisk together the tamari, toasted sesame oil, grated Asian pear, honey, minced garlic, grated ginger, and black pepper to create the marinade.
Place the thinly sliced flank steak in a shallow dish and pour the marinade over it, tossing to coat evenly; let it sit for at least 15 minutes.
Heat the avocado oil in a large skillet or wok over high heat until it begins to shimmer.
Add the beef to the skillet in a single layer, working in batches if necessary, and sear for 1-2 minutes per side until caramelized and cooked through.
Remove the beef from the skillet and set aside; in the same pan, quickly sauté the cauliflower rice for 3-4 minutes until tender.
Divide the cauliflower rice into bowls, top with the beef bulgogi, and garnish with sliced green onions and toasted sesame seeds.