Slice the flank steak against the grain into very thin strips to ensure maximum tenderness.
In a small glass bowl, whisk together the tamari, toasted sesame oil, minced ginger, minced garlic, raw honey, and red pepper flakes to create the glaze.
Heat the avocado oil in a large stainless steel skillet or wok over medium-high heat until it begins to shimmer.
Add the beef strips in a single layer and sear for 2 minutes until beautifully browned, then remove the beef from the pan and set aside.
Add the broccoli florets to the same pan with a tablespoon of water, cover immediately, and steam for 3 minutes until tender-crisp and bright green.
Return the beef to the pan, pour the prepared sesame-ginger glaze over the top, and toss for 1 minute until the sauce thickens and coats every piece.
Transfer to a plate, garnish with sesame seeds, and serve immediately while hot.