Slice the flank steak against the grain into thin strips and season with the sea salt and black pepper.
In a small bowl, whisk together the coconut aminos, toasted sesame oil, 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 it begins to shimmer.
Add the beef strips in a single layer and sear for approximately 2 minutes until browned and caramelized, then remove the beef from the pan and set aside.
Add the broccoli florets and sliced red bell pepper to the same pan with a tablespoon of water, covering with a lid for 2 minutes to steam-fry until tender-crisp.
Remove the lid, return the beef to the pan, and pour the prepared sauce over the mixture.
Toss everything together for 1 minute over high heat until the sauce thickens and evenly coats the beef and vegetables.
Garnish with sesame seeds and serve immediately.