Marinate the beef

• Slice the beef thinly against the grain.
• Toss with soy sauce and cornstarch and let it sit.

Mix the stir-fry sauce

• Combine the remaining soy sauce, oyster sauce, brown sugar and sesame oil.
• Stir until the sugar dissolves.

Blanch the broccoli

• Boil the broccoli florets in salted water until crisp-tender.
• Drain and set aside.

Sear the beef

• Heat the vegetable oil in a wok over high heat.
• Sear the beef in a single layer until browned, then remove.

Stir fry the aromatics

• Add the garlic and ginger to the wok.
• Stir fry until fragrant.

Combine and finish

• Return the beef with the broccoli and pour in the sauce.
• Toss over high heat until everything is coated and glossy.
• Sprinkle with sesame seeds and serve.