01 - In a medium bowl, whisk together soy sauce, beef broth, oyster sauce, brown sugar, rice vinegar, and sesame oil until fully dissolved and uniform.
02 - Stir in the minced garlic and ginger until evenly distributed throughout the sauce mixture.
03 - In a small separate bowl, mix cornstarch and cold water until no lumps remain, creating a smooth slurry.
04 - Pour the slurry into the sauce mixture and whisk vigorously until completely smooth and integrated.
05 - Pour sauce over cooked beef and broccoli in a heated pan. Stir continuously and simmer for 2-3 minutes until sauce achieves desired thickness and evenly coats all ingredients.