Slice the flank steak against the grain into thin, bite-sized strips to ensure maximum tenderness.
Mince the garlic clove and finely grate the fresh ginger.
Heat the avocado oil in a large skillet or wok over medium-high heat until shimmering.
Add the beef strips in a single layer, seasoning them with the sea salt and black pepper.
Sear the beef for 2-3 minutes until browned and caramelized, then remove from the pan and set aside.
Add the broccoli florets to the same pan with a splash of water, covering for 2 minutes to steam-sauté until bright green and tender-crisp.
Stir in the minced garlic and grated ginger, cooking for 30 seconds until the aromatics are fragrant.
Return the beef to the pan and pour in the coconut aminos and toasted sesame oil.
Toss all ingredients together for 1 minute to allow the glaze to thicken and coat the beef and broccoli.
Transfer to a plate and garnish with the sesame seeds before serving hot.