Black Pepper Beef & Onion Stir-Fry (So Tender!)

How to make Black Pepper Beef & Onion Stir-Fry at home![ASMR]

Ingredients:
550g beef
1/2 onion
50g scallions
4 garlic cloves

Seasonings:
Light soy sauce
Rice wine
Dark soy sauce
Black pepper
Sugar
Baking soda
Cornstarch
Oyster sauce
Salt
Cracked black pepper