1. Thinly slice the flank steak against the grain into bite-sized strips and season with sea salt and black pepper.
2. In a small bowl, whisk together the coconut aminos, minced ginger, and minced garlic to create the stir-fry sauce.
3. Heat the toasted sesame oil in a large skillet or wok over medium-high heat until shimmering.
4. Add the beef strips to the hot pan in a single layer and sear for 2-3 minutes until browned and caramelized.
5. Remove the beef from the pan and set aside, then add the broccoli florets and sliced red bell pepper with a splash of water.
6. Steam-fry the vegetables for 3-4 minutes until they are tender-crisp and bright green.
7. Return the beef to the pan, pour the sauce over the mixture, and toss everything together for 1 minute until the glaze thickens.
8. Garnish with sliced green onions and serve immediately while hot.