All the vibrant flavors of a Caesar dressing go wonderfully with pasta, making this the ideal way to enjoy the classic salad without the wilted lettuce that would result from making it ahead. Replacing the dressing’s traditional egg enrichment with creamy low-fat yogurt results in a dish that will keep far better for outdoor enjoyment. Quickly grilled chicken transforms it into a main dish. You could either make the chicken ahead, as described below, tossing it with the rest of the salad; or make the salad without that addition, grilling the chicken in your backyard or at the picnic site, slicing it, and draping the slices over each serving. Steak makes an excellent alternative to the chicken. If you like, serve the salad on a bed of Romaine lettuce leaves – a nod towards the original Caesar.