01 - Rinse the rice under cold water until clear. Combine with water in a pot or rice cooker, bring to a boil, reduce heat, cover, and simmer for 15 minutes until tender. Remove from heat and let stand covered for 10 minutes.
02 - In a medium bowl, combine beef, soy sauce, mirin, and cornstarch. Mix thoroughly and marinate for at least 10 minutes.
03 - In a small bowl, whisk together soy sauce, oyster sauce, brown sugar, sesame oil, garlic, ginger, and broth. Set aside.
04 - Heat a large skillet or wok over medium-high heat. Add oil, sauté onions and carrots until slightly softened, about 2–3 minutes.
05 - Increase heat to high, add marinated beef, stir-fry for 2–3 minutes until browned.
06 - Pour in the prepared sauce, cook for 2–3 minutes while stirring until the sauce thickens and coats the beef. Add green onions and toss briefly.
07 - Fluff the steamed rice and divide among bowls. Spoon beef and sauce over the rice. Garnish with extra green onions and toasted sesame seeds if desired. Serve hot.