Preheat oven to 200℃ (180℃ fan forced). Line a large baking tray with baking paper. Place Lebanese bread onto tray and spray both sides with olive oil spray. Season with the sumac and salt & pepper to taste. Bake in the oven for 10-12 minutes, turning halfway through, or until golden and crisp. Remove and allow to cool, then break into rough pieces using your hands. Set aside or place into an airtight container until required.
Combine all remaining salad ingredients into a large bowl and toss to combine. Cover and chill until required.
When ready to serve, add the pita crisps to the salad mixture and pour over the Sumac Dressing. Using clean hands, mix until well combined making sure to coat all ingredients evenly with the dressing. Serve immediately with your choice of proteins or other sides.