Thinly slice the flank steak against the grain into bite-sized strips and season with sea salt and black pepper.
In a small bowl, whisk together the tamari, toasted sesame oil, honey, minced ginger, and red pepper flakes to create the stir-fry glaze.
Heat one teaspoon of avocado oil in a large skillet or wok over medium-high heat.
Add the broccoli florets and a splash of water, then cover and steam for 2-3 minutes until bright green and tender-crisp.
Remove the broccoli from the pan and set aside.
Wipe the pan dry, add the remaining teaspoon of avocado oil, and increase heat to high.
Add the beef strips in a single layer and sear for 1-2 minutes per side until browned and caramelized.
Add the minced garlic to the beef and sauté for 30 seconds until fragrant.
Return the broccoli to the pan and pour the sesame-ginger glaze over the mixture.
Toss everything together for 1 minute until the sauce thickens and coats the beef and vegetables.
Garnish with sesame seeds before serving hot.