To make great fajitas you need one pound of chicken breasts cut into strips. Place the chicken in a plastic bag and mix 1 cup of salsa with one cup of zesty italin salad dressing, add 1 tablespoon of lemon juice and one tablespoon of worchestershire sauce. Merinate the chicken for 2 hours. Cut up 1 yellow pepper, 1 red pepper and 1 medium sized onion. Cook all the ingredients together in a pan with 2 tablespoons of oil until vegetables are soft and chicken is cooked through. Serve with tortillas and guacamole.