Instructions

1. In a medium bowl, combine the sliced flank steak, soy sauce, sriracha sauce, garlic, ginger, and cornstarch (if using). Let marinate for about 10 minutes.
2. While the beef is marinating, bring a pot of water to a boil. Add the broccoli florets and blanch for 2-3 minutes until bright green and slightly tender. Drain and set aside.
3. Heat a large skillet or wok over medium-high heat and add the sesame oil.
4. Once the oil is hot, add the marinated beef to the skillet in a single layer. Sear the beef for about 1-2 minutes without stirring to get a nice color, then stir-fry until browned and cooked through, about 3-4 minutes.
5. Add the blanched broccoli to the skillet and stir to combine.
6. Pour in the water and bring to a simmer. If using cornstarch, this is the time it will help thicken the sauce. Stir everything together until the sauce thickens slightly, about 1 minute.
7. Remove from heat, garnish with sesame seeds, and serve immediately.