Pat the flank steak dry with a paper towel and slice it against the grain into thin, bite-sized strips.
In a small bowl, whisk together the tamari, toasted sesame oil, grated ginger, minced garlic, raw honey, and red pepper flakes to create the glaze.
Heat the avocado oil in a large skillet or wok over medium-high heat until it begins to shimmer.
Add the broccoli florets to the pan with a small splash of water; cover immediately and steam for 2 minutes until they are bright green and tender-crisp.
Remove the broccoli from the pan and set aside, then increase the heat to high.
Add the beef strips to the pan in a single layer, seasoning them with sea salt and black pepper.
Sear the beef for 2-3 minutes without moving it to develop a deep brown crust, then toss and cook for an additional minute.
Return the broccoli to the pan and pour the prepared sauce over the mixture, tossing constantly for 30-60 seconds until the glaze thickens and coats every piece.
Garnish with toasted sesame seeds and serve immediately while the beef is juicy and the broccoli is vibrant.