Start by thinly slicing your beef against the grain. This ensures tenderness in every bite. Toss the sliced beef into a bowl with soy sauce, garlic, and cornstarch for marination. Give it about 15-20 minutes to soak up the flavors.
Wash your broccoli florets and trim them into bite-size pieces. Bring a pot of water to a rolling boil 🫗 and blanch the broccoli for 2 minutes. Immediately plunge them into an ice bath to lock in that bright green hue.
Grab a bowl and combine your oyster sauce, brown sugar, soy sauce, sesame oil, and a sprinkle of red pepper flakes for a little heat. Mix until smooth and set aside.
Heat your wok or skillet over high heat and drizzle in the vegetable oil. Toss in the marinated beef and stir-fry for about 2-3 minutes until it’s browned and cooked through. Once done, set it aside.
Using the same pan, add a touch more oil if needed. Stir-fry the blanched broccoli for about 2 minutes, ensuring it stays crisp and vibrant.
Return the cooked beef to the pan and pour in your sauce. Toss everything together until every piece is beautifully coated in the savory goodness. Garnish with sesame seeds and green onions to add a final pop of color and flavor.