Barbecued beef (korean bul kogi)

2 lb Sirloin Steak
      3    Scallions
      4    Cloves garlic
      5 tb soy sauce
      2 tb Sesame oil
    1/4 c  Sugar
      2 tb Sherry
    1/4 c  Beef stock (optional)
    1/8 ts Black pepper
 
  1.  Slice the steak very thin on the bias. Score each piece with an X.
  
  2.  Chop the scallions and crush the garlic. Combine these ingredients with
  the remaining seasonings in a bowl. Add the meat to the marinade and mix
  well until all sides of the steak are coated.
  
  3.  The meat may be grilled immediately. The best results are obtained if
  the steak is marinated for 2 hours. The marinade will keep overnight
  
  Variation: Use rib steak or flank steak.
  
  Bul Kogi is so popular that many Koreans consider it the national meat
  dish.  Serve with rice and kimchi.
  
  From: The Korean Cookbook, by Judy Hyun.