Cut the chicken into small pieces. Heat a large nonstick skillet or wok to screaming hot. Add vegetable oil, then chicken. Cook chicken 2 minutes, stirring constantly. Add the ginger, garlic,chili paste (if using), red pepper and broccoli slaw; cover pan and cook another 2 minutes. Add hoisin sauce to glaze the mixture, cover pan and let cook 3 minutes or until broccoli slaw is cooked. Add fish sauce, soy sauce and scallions and turn to coat. Place chopped romaine letters into bowls. Top with cooked chicken and vegetables to a bowl. Top each bowl with chopped cucumber and cilantro. You could also serve this over rice.