Slice the flank steak against the grain into thin strips and season with sea salt and black pepper.
In a small bowl, whisk together the coconut aminos, minced garlic, grated fresh ginger, and arrowroot starch to create the glaze.
Heat a large skillet or wok over medium-high heat and add the toasted sesame oil.
Add the beef strips to the hot skillet in a single layer and sear for 2-3 minutes until browned, then remove the beef and set aside.
Add the broccoli florets to the same pan with two tablespoons of water, cover with a lid, and steam for 3 minutes until vibrant green and tender-crisp.
Return the beef to the pan, pour the sesame-ginger glaze over the mixture, and toss for 1 minute until the sauce thickens and coats the ingredients.
Garnish with sesame seeds and serve immediately while hot.