Black Pepper Chicken

Name: Black Pepper Chicken
Prep time: 20 min
Cook time: 10 min
Total time: 30 min
Cuisine: Asian, Chinese
Ingredients: 12 ounces boneless skinless chicken breast ((or thighs)); 3 tablespoons water; 1 teaspoon cornstarch; 1 teaspoon neutral oil ((such as vegetable, canola, or avocado oil)); 2 teaspoons oyster sauce; 1/2 teaspoon coarsely ground black pepper; 1/2 cup low sodium chicken stock; 1 tablespoon oyster sauce; 1 tablespoon light soy sauce; 1 teaspoon sugar; 2 teaspoons dark soy sauce; 1/2 teaspoon sesame oil; 3 tablespoons neutral oil ((divided)); 2 cloves garlic ((finely chopped)); 1 medium onion ((cut into wedges)); 1 tablespoon Shaoxing wine; 1/2 bell pepper ((any color, cut into 1-inch/2.5cm pieces)); 1 stalk celery ((thinly sliced on an angle)); 1 teaspoon coarsely ground black pepper; 1 1/2 teaspoons cornstarch ((mixed with 2 tablespoons water to form a cornstarch slurry))