Mix the herbs with oil until a thick dressing is formedHeat the oil in the pan.Stir fry the chicken until golden brown.Add the vegetables and the herb dressing.Heat this for about 10 minutes.Bake the tacos according to the instructions.Cut the lettuce into thin strips and fill the tacos with the lettuce.Add the chicken and vegetables.Finely chop the spring onion.Sprinkle the tacos with cheese and the spring onion.Serve it with the Mexican sauce.