Slice the flank steak against the grain into very thin strips for maximum tenderness.
Heat the toasted sesame oil in a large skillet or wok over medium-high heat.
Season the beef strips with sea salt and black pepper, then sear in the hot pan until browned on all sides.
Remove the beef from the pan and set aside, then add the broccoli, sliced bell peppers, and snap peas.
Stir-fry the vegetables for 3-4 minutes until they are bright and tender-crisp.
Add the minced garlic and grated fresh ginger to the pan, stirring for 30 seconds until aromatic.
Return the beef to the skillet and pour in the coconut aminos, tossing everything together to coat in the glaze.
In a separate small skillet, lightly sauté the cauliflower rice for 2 minutes until heated through.
Plate the stir-fry over the cauliflower rice and garnish with a sprinkle of sesame seeds before serving.