Place the flank steak in the freezer for 15 minutes to firm up, then slice it very thinly against the grain into bite-sized strips.
In a medium bowl, whisk together the tamari, toasted sesame oil, raw honey, grated pear, minced garlic, and grated ginger.
Add the sliced beef to the marinade, tossing well to coat, and let it sit at room temperature for 15-20 minutes.
While the beef marinates, place the broccoli florets and sliced carrots in a steamer basket over boiling water and steam for 5 minutes until tender-crisp.
Heat a non-stick skillet over medium-high heat and add the cauliflower rice, sautéing for 3-4 minutes until heated through and slightly softened, then set aside.
Wipe the skillet clean, return to high heat, and add the beef in a single layer, searing for 1-2 minutes per side until deeply browned and caramelized.
Divide the cauliflower rice between bowls, top with the sesame-ginger beef and steamed vegetables, and garnish with red pepper flakes and sesame seeds.