Ingredients 2 medium zucchini (1 pound), cut into 1/2-inch slices 2 medium yellow or pattypan squashes (1 pound), cut into 1/2-inch slices 2 medium eggplants (2 pounds), cut into 1/2-inch rounds Kosher salt and freshly ground pepper 3 tablespoons extra-virgin olive oil, plus more for drizzling 1 large yellow onion, peeled, halved, and thinly sliced (3 cups) 6 tablespoons sugar 1 cup red-wine vinegar 1/4 cup golden raisins 2 tablespoons capers, rinsed and drained 4 fresh bay leaves 1/2 pound sesame bread (from a 1-pound loaf), cut into thick slices 12 ounces assorted cured meats, such as prosciutto cotto, capocollo, and prosciutto di Parma 8 ounces burrata 6 ounces goat cheese, room temperature Flat-leaf parsley leaves, for serving Preparation Preheat grill for direct-heat cooking....