Step 1

Combine the soy sauce, green onion, sugar, garlic, sesame seeds, sesame oil, and pepper to make the marinade.

Step 2

Place the flank steak pieces in a shallow dish. Pour the marinade and make sure each piece gets coated nicely. Cover the dish and refrigerate it for at least 1 hour or overnight.

Step 3

Preheat the grill to high heat and lightly grease the grate.

Step 4

Grill the flank steak slices until cooked through and charred slightly, about 1 to 2 minutes per side. Serve over rice and enjoy!