Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   2       tb           Hoisin sauce (mine had no
                        Added oil or fat)
   1       tb           Chili sauce (again, mine had
                        No added oil or fat)
   1       tb           Rice wine or dry sherry (I
                        Omitted this with no
                        Problem)
   1       tb           Low-sodium soy sauce
   1       tb           Minced scallion (white part
                        Only)
   2                    Garlic cloves, minced
   1 1/2                " piece pared fresh ginger
                        Root, minced
   6       oz           Portabella mushroom caps

Preparation:

To prepare marinade, combine hoisin and chili sauces, wine, soy sauce, scallion, garlic, and ginger in bowl. Clean mushroom caps, and place top down on shallow dish. Spoon mixture into top, and allow to marinate for a few hours. (I just let mine sit while my dough was rising.)