Thinly slice the flank steak against the grain into bite-sized strips and season with sea salt and black pepper.
In a small bowl, whisk together the tamari, minced fresh ginger, minced garlic, and honey to create the stir-fry sauce.
Heat the avocado oil in a large skillet or wok over high heat until shimmering.
Add the beef strips in a single layer and sear for 2 minutes until browned and sizzling; remove beef from the pan and set aside.
Add the broccoli florets to the same pan with a splash of water, cover with a lid for 2 minutes to steam until bright green and tender-crisp.
Remove the lid, return the beef to the pan, and pour in the prepared sauce and toasted sesame oil.
Toss everything together for 1 minute until the sauce thickens slightly and coats the beef and broccoli.
In a separate small skillet, quickly sauté the cauliflower rice with a pinch of salt for 3-4 minutes until warmed through.
Serve the beef and broccoli over the cauliflower rice and garnish with sesame seeds and red pepper flakes.