01 - In a medium bowl, whisk together soy sauce, beef broth, oyster sauce, brown sugar, rice vinegar, and sesame oil until well combined.
02 - Stir in the minced garlic and ginger until evenly distributed throughout the sauce mixture.
03 - In a small bowl, mix cornstarch and cold water until smooth and no lumps remain.
04 - Add the cornstarch slurry to the sauce mixture and whisk thoroughly until fully integrated and smooth.
05 - Pour sauce over cooked beef and broccoli in the pan. Stir continuously and simmer for 2-3 minutes until the sauce thickens and coats the ingredients evenly.