Thinly slice the steak and place it in a bowl.

Thinly slice the onion and chop the green onions.

Add the sliced onion and chopped green onions to the bowl with the steak.

Julienne the carrots into matchstick-sized pieces.

Add the julienned carrots and all other ingredients (sesame oil, soy sauce, sugar, black pepper, chopped garlic, toasted sesame seeds) to the bowl with the steak and vegetables.

Mix all the ingredients well to ensure the steak is evenly coated in the marinade.

Heat a large frying pan or wok over high heat until very hot.

Add the meat mixture to the hot pan and stir-fry until the meat is cooked through and slightly browned.

Spoon the stir-fried meat and vegetables over hot cooked white rice.

Serve immediately.