Pour in the prepared sauce and the stock. Bring to a boil. Return the beef and onion to the skillet. Stir for about 1 minute until cooked. Dish off.

• 将调好的黑椒汁和上汤入锅烧开。牛肉和洋葱丝回锅翻炒1分钟左右即可盛盘。