Simple Tuna Pasta Salad

Cook pasta according to package directions-rinse under cold water and drain well.
In a large bowl, combine the pasta, tomatoes, celery , peas, onion and tuna.
Prepare the dressing by whisking together the mayonnaise, salad dressing, sugar and pepper. Add to pasta salad, mix together, and refrigerate for 1 hour. (if you are tight for time- when you rinse the pasta with cold water, continue rinsing till the pasta gets really cold; through it together and serve.)