1/4 cup soy sauce
2 tablespoons hoisin sauce (optional)
1 tablespoon cornstarch mixed with 2 tablespoons water (slurry for thickening)
1/2 teaspoon black pepper (or more, to taste)
1/4 teaspoon red pepper flakes (optional, for spice)
Preparation
Step 1: Marinate the Beef
In a bowl, mix the soy sauce, oyster sauce, cornstarch, and sesame oil.
Add the beef slices to the marinade and toss to coat evenly. Let sit for at least 15 minutes (up to 30 minutes for deeper flavor).
Step 2: Prepare the Sauce
In a small bowl, whisk together the soy sauce, hoisin sauce (if using), black pepper, and the cornstarch slurry. Set aside.
Step 3: Stir-Fry the Vegetables
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