BEEF MIXTURE:

3/4 lb. flank or round steak, cut across grain into 1/8 x 2 inch strips
1 tbsp. cornstarch
1 egg white
4 tbsp. vegetable oil
1 tsp. minced ginger
2 stalks green onions, cut finely, 1/4 inch pieces

SEASONING SAUCE:

4 tbsp. soy sauce
4 tbsp. cider vinegar
2 tbsp. dry sherry
1 tsp. sugar
1/4 tsp. salt
1/2 tsp. sesame oil

Heat 2 tablespoons of oil, using high heat, and stir-fry beef mixture for a minute. Remove and drain. Heat 2 more tablespoons of oil and stir-fry ginger and green onions until ginger becomes golden. Add sauce mixture and cooked beef mixture. Stir-fry additional 15 seconds. Add sesame oil and mix well. Serve hot.