light colored oil, such as vegetable oil or peanut oil • chicken meat, finely diced • shiitake mushrooms, finely diced • Coarse salt and coarse black pepper • garlic, finely diced • ginger root, finely diced • orange, zested, squeezed • red bell pepper, finely diced • to 8 ounces, water chestnuts, finely diced • scallions, chopped • hoisin, Chinese barbecue sauce, available on Asian foods aisle of market • large head iceberg lettuce, core removed, head quartered