Place the flank steak in the freezer for 15 minutes to firm up, then slice it very thinly against the grain into bite-sized strips.
In a small bowl, whisk together the coconut aminos, minced garlic, and grated fresh ginger to create the stir-fry glaze.
Season the beef strips evenly with sea salt and black pepper.
Heat a large cast-iron skillet or carbon steel wok over high heat and add the toasted sesame oil.
Once the oil is shimmering, add the beef in a single layer and sear for 1-2 minutes until browned and caramelized; remove beef from the pan and set aside.
In the same pan, add the broccoli florets, sliced red bell pepper, sugar snap peas, and shelled edamame, tossing frequently for 3-4 minutes until tender-crisp.
Return the beef and any accumulated juices to the pan, then pour the ginger-sesame glaze over the mixture.
Toss everything together for 1 minute until the sauce thickens slightly and coats every ingredient.
Transfer to a plate and garnish with sesame seeds before serving immediately.