In a bowl, mix together the beef strips in Hoisin sauce, soy sauce, sesame oil, garlic powder, and black pepper. Cover the bowl and marinate for 3-4 hours or overnight.
After marinating for 4 hours.
Heat up oil in a wok/pan. Add the marinated beef strip into the wok to sauté. Stir a few times. Add water, cover the wok and let that cook to brown and tenderize the beef. After the water reduces a bit, add the onions, garlic, and ginger to sauté. Stir and cook for a couple of minutes.
Stir in the broccoli florets. Let that cook for a few minutes to soften the broccoli.
