kris's pf changs lettuce wraps

My friend Kris brought these lettuce wraps to gourmet club.  Lettuce wraps are always a hit.  I remember when my friend Annie made them for my surprise baby shower a few years ago.  Lettuce wraps have a fond place in my heart.

pf changs lettuce wraps (my friend Kris)
16 Boston, bibb or butter lettuce leaves
1 pound ground chicken breast
1 large onion, chopped
1/2 cup pine nuts, chopped
2 tablespoons minced garlic
1 tablespoon reduced-sodium soy sauce
1/4 cup hoisin sauce
2 teaspoons minced fresh ginger
1 tablespoon rice wine vinegar or red wine vinegar
2 teaspoons Asian chili pepper sauce
1 can (8 ounce) sliced water chestnuts, drained and finely chopped
1 bunch green onions, thinly sliced
2 teaspoons sesame oil

Rinse lettuce leaves, keeping them whole.  Set aside to drain.
Cook chicken in a large skillet over medium heat, stirring often to break up the meat.  Add onion, garlic, soy sauce, hoisin sauce, ginger, vinegar nad chill sauce.  Cook until the meat is crumbled and brown.  Add water chestnuts, pine nuts and green onions.  Cook until onions begin to wilt, about 2 minutes.
Stir in sesame oil.  Arrange lettuce leaves on the outer edge of a platter.  Spoon meat mixture in center.  Allow diners to spoon meat mixture onto lettuce leaves and eat like a taco.