Spicy Ginger Pork in Lettuce Leaves (Wraps)

1 red bell pepper , finely diced

1 garlic clove , minced (or 1 tsp. minced garlic)

1 tablespoon crushed ginger (from a jar)

1 tablespoon thai sweet chili sauce

1 tablespoon fish sauce

1 tablespoon sesame oil

1 (8 ounce) can water chestnuts (drained and diced)

2 scallions (thinly sliced)

2 tablespoons cilantro , chopped

1 head boston lettuce (leaves separated and rinsed)