The first step to making this dish is to marinade the beef. I like to marinade mine in a shallow baking dish or airtight container so that all of the meat gets marinated evenly.
The first thing to do is mix up the marinade. Place 1/2 cup soy sauce, 1/4 cup sesame oil, and 1/2 tsp baking soda in a large bowl.
Slice the beef against the grain in 1/4-1/2 inch slices. Place steak in a dish, or bowl and cover with the marinade.
Cover and place in the refrigerator for at least 30 minutes.
When ready to cook heat oven to 450.
Whisk together the sauce ingredients in a medium bowl, 2 tablespoon soy sauce, 1 tablespoon sesame oil, 1 tsp fresh minced garlic, 1 tsp fresh ginger, and 2 tablespoons corn starch, mix well until everything is well incorporated.
Remove the meat from the marinade and spread evenly across a baking sheet. Spread the broccoli evenly out among the meat.
Pour the sauce mixture evenly across the meat and broccoli. Gently stir to help spread the sauce evenly across everything. I like to use tongs to gently stir and spread everything into an even layer.
Place the baking sheet in the oven and bake for 15-20 minutes.
Serve warm sprinkled with sesame seeds if desired.
Store any leftovers refrigerated in an airtight container.