Heat a large skillet to screaming hot. Add vegetable oil, then chicken. Cook chicken 2 minutes, stirring constantly. Add the ginger, garlic, peppers, cabbage and carrot mix and scallions and stir-fry another 2 minutes. Add plum sauce to glaze the mixture, toss 1 minute, then add basil and wilt leaves. Add fish sauce and turn to coat. Transfer cooked chicken and vegetables to a bowl. Place spoonfuls of chicken into a piece of lettuce with cucumber and fold lettuce over to eat, like small tacos.