Grilled Zucchini and Bell Pepper Fattoush

Name: Grilled Zucchini and Bell Pepper Fattoush
Ingredients: 1 (8 ounce) cucumber, peeled, halved, seeded, cut into 1/2 inch cubes; 1 4 ounce piece feta cheese, cut into 1/2 inch cubes (scant 1 cup); 1 cup (scant) pitted Kalamata olives, halved; 1 teaspoon ground cumin; 1/2 cup (packed) fresh mint leaves; 1/3 cup chopped fresh cilantro; 1/4 cup fresh lemon juice; 12 cherry tomatoes, each halved; 2 (5 to 6 inch) pita breads, each cut horizontally into 2 disks, or two 6x4x1/2 inch slices country white bread; 3 green onions, thinly sliced; 3 medium orange or red bell peppers (about 1 pound), stemmed, seeded, quartered; 4 to 5 slender zucchini (about 1 pound), trimmed, cut lengthwise in half; Ground sumac* (optional)