Slice the flank steak against the grain into thin strips and season evenly with sea salt and black pepper.
In a small bowl, whisk together the tamari, honey, grated fresh ginger, and minced garlic to create the stir-fry sauce.
Heat the toasted sesame oil in a large skillet or wok over medium-high heat until shimmering.
Add the beef strips to the pan in a single layer and sear for 2-3 minutes until browned, then remove the beef and set aside on a plate.
Add the broccoli florets to the same pan with a splash of water, covering with a lid for 2 minutes to steam until vibrant green and tender-crisp.
Return the beef to the pan, pour in the prepared sauce, and toss everything together for 1 minute until the glaze coats the ingredients and thickens slightly.
Garnish with sesame seeds and serve immediately.