Cook rice according to instructions (see below).
Toss the steak strips with the cornstarch to coat.
In a small bowl, whisk together the soy sauce, water, pear, ginger, and rice vinegar. Set aside.
In a large skillet, warm the oil over medium-high heat. Once the oil is hot, add the steak strips in an even layer and let cook for 3-4 minutes, or until nicely browned. If your skillet isn’t large enough, you can cook the steak in batches, but you should be able to fit it all snuggly!
Use a spatula to flip and mix the steak around. Reduce the heat to medium, add the garlic, chili flakes, and black pepper, and cook for 30 seconds, stirring often. Add the broccoli and cook for 1 more minute, stirring often.
Pour the sauce into the skillet, stir everything around, and let cook/simmer in the sauce for about 3-4 minutes or until the liquid reduces, stirring occasionally and scraping any bits stuck to the bottom of the pan.
Serve over warm rice and top with plenty of herbs and sesame seeds.