Bring a large saucepan of lightly salted water to a boil. Add penne pasta and cook for 8 to 10 minutes or until al dente; drain.
Melt butter in a large frypan over medium heat. Add chicken, pepper and salt. Cook 10 minutes or until chicken is cooked through. Remove frypan from heat.
In a bowl mix together salad dressing, vinegar and cheese. Toss together pasta, chicken, lettuce and dressing mixture. Place in large serving bowl and sprinkle with tomato. Garnish with croutons and Parmesan curls, if desired.