Broccoli: In a pot of boiling water, cook 1 head of broccoli, cut into florets for 2 minutes until tender. Remove and submerge in a bowl of ice water. Remove the broccoli and pat dry with a clean kitchen towel or paper towel.
Sauce: Lee Kum Kee brand Broccoli & Beef Sauce. It tastes like the real deal, and the ingredients are recognizable, not scary.
The beef: Heat 2 tablespoons of vegetable oil in a cast iron or stainless steel pan. Pat the beef dry of any excess marinade and then cook according to package instructions or until desired doneness.
Add the onions and broccoli into the pan with the beef and coat with sauce.
Serve on a bed of white rice. Garnish with toasted sesame seeds.