In a bowl, combine the light soy sauce, honey, rice vinegar, sesame oil, garlic, and sake if using. Mix thoroughly and set aside.
Heat a pan over medium-high heat with a bit of oil. Add the steak and cook for 6½ minutes, flipping every 30 seconds, then remove from the heat and let it rest.
Pour the sauce into the same pan and bring it to a simmer. Take it off the heat once it has slightly thickened.
Slice the rested steak into thin slices, place over a fresh bowl of rice, and top with the sauce.
Optionally garnish with furikake, scallions, and red peppers.
