In a medium bowl, mix sliced flank steak with 1 tablespoon of cornstarch and 2 tablespoons of soy sauce.
Heat a large nonstick pan over high heat and add in 2 tablespoons of ghee. Swirl it around to coat pan.
Once ghee is very hot (this only takes a few seconds), add in the beef in one layer.
Sear for 1 minute and then flip the slices to cook for another minute on the other side.
Set beef and its juices aside onto a plate.
With the same pan on high heat, add 1 tablespoon of ghee.
Add onion, garlic, and ginger. Mix to sauté for about 3 minutes.
Add in the broccoli and red chili flakes. Mix to sauté for another 3 minutes.
In a small mixing bowl whisk together beef/bone broth, 1 tablespoon cornstarch, ¼ cup of soy sauce, and the optional brown sugar. Pour over the broccoli mixture. Mix to combine and cook on for about 3 minutes.
Add the beef and its juices back into the pan and mix all the ingredients to incorporate.
Immediately remove pan from heat and serve over rice. Don’t forget to spoon the juices over the top. Yum!