Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   6                    chicken breasts -- boneless
   2      cups          pineapple juice
   2      tablespoons   Worcestershire sauce
     1/4  cup           soy sauce
   2      tablespoons   sugar

Preparation:

In a bowl combine all ingredients except for chicken. Stir. Using a fork, poke about 5-8 sets of holes in each chicken breast. Put chicken in marinade, making sure it is covered in the mixture. Add more pineapple juice if necessary. Cover and refrigerate for 24-36 hours. Grill.