Thinly slice the flank steak against the grain into bite-sized strips.
In a small bowl, whisk together the tamari, honey, minced garlic, and grated ginger.
Toss the beef in the marinade and let it sit for 10 minutes at room temperature.
Heat a large non-stick skillet over medium-high heat and sear the beef until browned and caramelized, then remove from the pan.
In the same skillet, add the sesame oil and chopped kimchi, sautéing for 2 minutes until fragrant.
Add the cooked brown rice, sea salt, and black pepper to the skillet, stir-frying for 3-4 minutes until the rice is heated through.
In a separate small non-stick pan, fry the egg until the whites are set but the yolk remains runny.
Divide the kimchi rice into a bowl, top with the bulgogi beef and the fried egg, then garnish with sliced green onions.