For this easy healthy salad, chef Hugh Acheson shows the power of charring vegetables as a way to add interest to a salad. This flexible recipe can be made with a variety of whole grains, such as wheat berries, farro or pearl barley. The salad revels in the spring arrival of radishes, spring onions and bright green parsley. Sumac, which is commonly used in Middle Eastern cooking, adds a touch of tartness. Look for it in well-stocked spice sections at your market.