1. Prepare the Sauce: In a small bowl, whisk together the soy sauce, rice vinegar, sesame oil, cornstarch, water, hoisin sauce (if using), and sriracha (if using). Set this flavorful sauce aside while you work on the rest of the dish.

2. Cook the Beef: Heat a wok or large skillet over medium-high heat and coat with cooking spray. Add the thinly sliced beef and stir-fry for 2-3 minutes until browned. Remove the beef from the pan and set it aside.

3. Sauté the Vegetables: In the same pan, add the garlic, ginger, red bell pepper, and bok choy stems. Stir-fry for 2-3 minutes to soften the veggies slightly. Then, toss in the bok choy leaves and cook just until they’ve wilted.

4. Combine and Finish: Return the cooked beef to the wok, pour in the prepared sauce, and stir-fry for another 2-3 minutes. The sauce will thicken and coat everything beautifully.

5. Serve and Enjoy: Garnish your Bok Choy Stir-Fried Beef with sliced green onions and toasted sesame seeds. Serve the dish hot, alongside steamed rice or noodles for a complete and satisfying meal.