Many are familiar with tonnato (tuna) sauce: it is spooned over chilled veal or chicken breast slices to make a tasty meal. However in this version, it is the dressing which coats the salad ingredients and makes quite an impressive salad that is perfect for company. I received a new cookbook last week and this recipe plus 2 more leaped out at me "to try first." The book is "Easy Pasta" published by Ryland, Peters, and Small. Note that though the list of ingredients is long, the gremolata is actually made from many of the same ingredients as the dressing, but roughly chopped. If you are not a purist (I'm not!), you can also substitute rotisserie chicken for the chicken in the recipe. Be sure to zest your lemon before you juice it and use a well flavored tuna for this salad; tuna packed in oil generally has the best flavor. Cooling time for the chicken is not included in the timing. Prepare the chicken in the morning for afternoon service. This is the perfect salad for Memorial Day or Fourth of July.