Yam cooking: stir-fry beef or lean meat with yam and celery. Method: Slice the yam into thin slices, add some vinegar, and marinate for 10 minutes. Cut the celery into thin slices. Heat a dry pan and add oil. Stir-fry the sliced ??beef and ginger until the beef is minced, basically 7 minutes. When cooked, add celery and yam and stir-fry, add a small amount of water and cook until cooked. A healthy and nutritious dish.