Slice the flank steak against the grain into thin, bite-sized strips and season with the sea salt and black pepper.
In a small glass jar, whisk together the tamari, toasted sesame oil, raw honey, minced ginger, and minced garlic until well combined.
Heat the avocado oil in a large cast-iron skillet or wok over medium-high heat until it begins to shimmer.
Add the beef strips in a single layer and sear for 2 to 3 minutes until deeply browned and caramelized, then remove from the pan and set aside.
Add the broccoli florets to the same pan with two tablespoons of water, covering with a lid to steam for 3 minutes until tender-crisp.
Return the beef to the skillet and pour the sesame sauce over the top, tossing everything together for 1 minute until the sauce is glossy and coats every piece.
Plate the stir-fry immediately and garnish with the sesame seeds for a final delicate crunch.