In a bowl, mix the sliced beef with baking soda and water. Let it sit for 15 minutes to tenderize. Rinse and pat dry.
Toss beef with soy sauce, oyster sauce, Shaoxing wine, cornstarch, sugar, and oil. Set aside.
Bring a pot of water to boil, add broccoli, and blanch for 30–45 seconds. Drain and set aside.
Heat oil in a pan over medium-high heat. Sear beef until browned but not fully cooked. Remove and set aside.
In the same pan, add oil, garlic, and ginger. Sauté until fragrant.
Add broccoli and beef back to the pan. Stir in oyster sauce, soy sauce, dark soy sauce, chicken broth, and sugar.
Pour in the cornstarch slurry and stir until the sauce thickens and coats the beef and broccoli.
Serve immediately with rice if desired.