1Trim ends from zucchini. Use a vegetable peeler to make long, thin ribbons of zucchini. For veggie filling, place zucchini ribbons, lettuce, cucumber, tomatoes, bell pepper, olives and basil in large bowl. For dressing, in small bowl, beat oil, lemon juice, salt and black pepper with whisk; pour over vegetable mixture, and toss to coat.
2Heat gas or charcoal grill. Cut block of cheese in half horizontally to form 2 blocks. Place both blocks of cheese directly on grill over high heat. Cook uncovered 4 to 6 minutes, turning once, until browned. Remove from grill. Cut each grilled cheese block into 12 cubes to make 24 cubes.
3Heat tortillas on grill about 30 seconds or until warm, turning once. Fill tortillas with veggie filling, and top with grilled cheese.