Thinly slice the flank steak against the grain into very thin bite-sized strips.
In a medium bowl, whisk together the coconut aminos, toasted sesame oil, honey, minced garlic, grated ginger, sea salt, and black pepper.
Add the beef strips and thinly sliced yellow onions to the marinade, tossing well to coat, and let marinate for at least 15 minutes.
Heat a large cast-iron skillet or wok over high heat until it is screaming hot.
Add the beef and onions to the skillet in a single layer, working in batches if necessary to avoid crowding the pan.
Sear the beef for 2-3 minutes without moving it much, allowing the edges to become deeply browned and caramelized.
Remove from heat and serve the beef bulgogi over the warm jasmine rice.
Garnish the dish with thinly sliced green onions and toasted sesame seeds for a final crunch.