Thinly slice the flank steak against the grain into bite-sized strips.
In a small bowl, whisk together the coconut aminos, minced garlic, grated ginger, and arrowroot powder to create the stir-fry sauce.
Heat the toasted sesame oil in a large skillet or wok over medium-high heat.
Add the beef strips to the skillet and season with sea salt and black pepper, searing until browned.
Toss in the broccoli florets and a splash of water, covering the pan for two minutes to steam the vegetables until tender-crisp.
Pour the prepared sauce over the beef and broccoli, stirring constantly until the glaze thickens and coats everything evenly.
In a separate pan, lightly sauté the cauliflower rice until heated through and slightly softened.
Serve the beef and broccoli over the cauliflower rice and garnish with sesame seeds for a final crunch.