Prep your beef – Pop it in the freezer for 15 minutes before slicing (easier to get thin slices). Then cut AGAINST the grain. This isn’t just chef talk – it actually makes the beef tender instead of chewy!
Mix the sauce – In a bowl, whisk together soy sauce, brown sugar, oyster sauce, rice vinegar, sesame oil, cornstarch, and water until smooth. Set aside. (This is your liquid gold – treat it with respect.)
Get your wok hot – Heat 1 tablespoon oil in a wok or large skillet over high heat until it’s smoking slightly. (Not hot enough? Your stir-fry will be sad and soggy. Too hot? Hello, fire alarm.)
Cook the beef – Add beef in a single layer and let it sear for 1 minute without touching it (I know you want to, but resist!). Then stir-fry for another minute until browned but not fully cooked. Remove to a plate.
Broccoli time – Add remaining oil to the wok. Toss in broccoli and stir-fry for 2 minutes. Add garlic and ginger and stir-fry for 30 seconds until fragrant. (Your kitchen should smell amazing right about now.)
Bring it all together – Return beef to the wok, pour in the sauce, and stir-fry for 1-2 minutes until sauce thickens and everything is coated.
Serve – Top with green onions and sesame seeds. Serve over rice and pretend you’re a culinary genius (because you are).