Mango Beef with Spring Onion

Ingredients

 * 3 tbsp + 1¾ tsp oil
 * 1¾ tsp cornstarch
 * 1 tsp sugar
 * 1 tsp salt
 * 1 lb beef tenderloin, cut in strips
 * ¼ cup chicken stock
 * 1 mango, cut in strips
 * 4 cups cooked rice
 * ½ cup chopped scallions

Directions

 * 1) Blend 1¾ tsp oil, cornstarch, sugar and salt.
 * 2) Add beef and toss to coat thoroughly.
 * 3) Let stand for 20 minutes.
 * 4) Heat wok until hot.
 * 5) Add remaining oil and heat until oil begins to smoke.
 * 6) Add beef and stir fry until beef is just cooked through, about 2 minutes.
 * 7) Remove beef with slotted spoon and discard all but 1 tbsp oil.
 * 8) Reheat wok and add scallions and beef.
 * 9) Stir fry quickly, 30 seconds.
 * 10) Add chicken stock and stir fry 30 seconds more.
 * 11) Add mango and toss mixture until the mango is warm.
 * 12) Serve immediately over rice.