This portable eggplant barley salad is perfect for your Labor Day picnic. Delicate pearls of barley are cooked with fragrant spices like cumin and coriander. The barley is then mixed with roasted vegetables, including eggplant, and tossed is a citrus vinaigrette. You can transport this salad in a large tupperware container or divide the salad into individual portions by serving it in mason jars. Either way, this eggplant barley salad is a "must-have" dish at your Labor Day celebration.