Typically, pressed sandwiches are a celebration of many meats. Here, we've opted for grilled eggplant slices, artichokes and arugula to make a satisfying vegetarian version. Giardiniera, a type of Italian relish typically made from bell peppers, celery, carrots, cauliflower, olives, vinegar and spices, perks up the flavors of any sandwich. You can use convenient prepared giardiniera or homemade. Choose a hot or mild version, depending on your preference for heat.