Slice the flank steak against the grain into thin strips and season evenly with the sea salt and black pepper.
In a small bowl, whisk together the coconut aminos, raw honey, toasted sesame oil, grated fresh ginger, minced garlic, and arrowroot powder to create the stir-fry sauce.
Heat the avocado oil in a large skillet or wok over medium-high heat until it begins to shimmer.
Add the beef strips to the hot pan in a single layer and sear for 2 minutes until a brown crust forms, then remove the beef and set it aside on a plate.
Add the broccoli florets and sliced red bell pepper to the same pan with a tablespoon of water, then cover with a lid for 2 minutes to steam until the broccoli is bright green and tender-crisp.
Return the beef to the pan and pour the prepared sauce over the ingredients.
Toss everything constantly for 1 minute until the sauce thickens into a glossy glaze that coats the beef and vegetables.
Garnish with sesame seeds and serve immediately.