Marinate chicken: Prepare the chicken by combining soy sauce, rice wine, pepper, and cornflour. Mix well and marinate.
Prepare sauce: Mix scallions, ginger, garlic, sesame seeds, sesame oil, and pepper in a small bowl. Stir until well combined.
Pan-fry the chicken: Add oil in a non-stick pan over medium heat and place the chicken pieces in the pan. Cook until lightly browned. Flip the chicken, then spoon the scallion-ginger sauce over the top. Cover the pan, reduce the heat to low-medium, and let it cook for 5 minutes.
Finishing Touches: Remove the lid, and if there’s excess water, turn the heat to high and let it reduce until the chicken starts sizzling.