Slice the flank steak against the grain into thin, bite-sized strips to ensure tenderness.
Heat the toasted sesame oil in a large skillet or wok over medium-high heat.
Add the beef strips to the pan, seasoning with sea salt and black pepper, and sear until browned, about 3-4 minutes.
Stir in the minced garlic and fresh ginger, cooking for 30 seconds until fragrant.
Add the broccoli florets and the water to the pan, then cover with a lid for 2 minutes to steam the broccoli until it is bright green and tender-crisp.
Remove the lid and pour in the coconut aminos, tossing everything together to coat the beef and vegetables in the sauce.
In a separate small pan or the microwave, lightly steam the cauliflower rice until warmed through.
Serve the beef and broccoli over the cauliflower rice and garnish with sesame seeds.