Wash and dry the tomatoes. On a tray or cutting board, remove the green ends of the tomatoes and slice them into approx. 3/8 to 1/2-inch slices. Arrange the tomato slices attractively on a serving dish. Sprinkle evenly with the dry salad dressing mix. Cover the dish with plastic wrap and refrigerate at least four hours for the salad dressing mix to create a marinade for the tomatoes. Remove from the refrigerator, take off the plastic wrap, and serve. This couldn't be easier--and it tastes great!!