1-First Step: Mince the red onion and garlic into similar-sized pieces to ensure even cooking and a consistent flavor base for your Chinese black pepper sauce.

2-Second Step: Heat 2 tablespoons of vegetable cooking oil or butter in a pan over medium heat until it shimmers, preparing the aromatics for frying.

3-Third Step: Add the minced garlic and onion to the hot oil or butter, frying them until they become slightly soft and aromatic, which should take about 1-2 minutes.

4-Fourth Step: Pour in 1 cup of beef broth or water to the pan, creating the liquid base that will carry the flavors of this black pepper sauce recipe.

5-Fifth Step: Stir in the ground black pepper, oyster sauce, light and dark soy sauces, sugar, and salt, mixing everything together to combine the ingredients thoroughly.

6-Sixth Step: In a small bowl, mix 2 tablespoons of cornstarch with 2 tablespoons of water and stir well to form a smooth slurry, avoiding any lumps before adding it to the pan.

7-Seventh Step: Reduce the heat to low and slowly pour the cornstarch mixture into the pan, stirring continuously to thicken the sauce evenly.

8-Eighth Step: Let the sauce simmer for one minute until it thickens and the flavors blend perfectly, resulting in a glossy, authentic Chinese black pepper sauce ready for serving.

9-Final Step: Remove the sauce from the heat and serve it hot over your choice of dishes like steak or stir-fries, adjusting the black pepper quantity for milder or spicier tastes as needed.